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Heidelun

Outer OneUpcoming

하이델룬

Flame of Freedom✦ Outer One
Rarity
Outer One
Element
Flame of Freedom
Faction
Unaffiliated
Class
Gunner - ranged physical
Voice Actor
Kang Su-jin
Unique Passive
System Heretic
Exclusive Weapon
Ex Nihilo
Ultimate
Unreal Black Hole
Original Korean Release Date
2025-07-08
Estimated Release Date
2026-12-09

Unique Passive

System Heretic Passive

TierEffect
First AcquisitionWhen you take fatal damage in a single hit while at 100% HP, you survive with 1 HP and enter Entropy Ghost (cooldown: 4). When you gain an action-control effect, you gain Sequence Break. • Entropy Ghost Cannot be removed (duration 2): Can attack enemies in Banish or Phase Leap state. This effect is treated as an action-control and Banish state, and cannot be targeted by skills or effects. • Sequence Break Cannot be removed (duration 2): After using a skill, gain an additional action and remove this effect.
Max AwakeningIf you have a debuff or are in Entropy Ghost state, critical hit chance increases by 30%. When you take fatal damage in a single hit while at 75% HP or higher, you survive with 1 HP and enter Entropy Ghost (cooldown: 3). If you would be banished, you enter Entropy Ghost state instead. When you gain an action-control effect, you gain Sequence Break.
Max ManifestationIf you have a debuff or are in Entropy Ghost state, critical hit chance and attack power increase by 30%. When you take fatal damage in a single hit while at 50% HP or higher, you survive with 1 HP and enter Entropy Ghost (cooldown: 2). If you would be banished, you enter Entropy Ghost state instead. When you gain an action-control effect, you gain Sequence Break. When hit by a skill-control effect or cooldown effect, reset the cooldowns of the 2 skills with the longest remaining cooldown.

Classes

Tier structure:

Tier

LvEffect
1Gunner
2Overrider, Agent
3Root Hacker, Chaos Blinger, L.T.K

Common Classes

Gunner Tier 1 A basic class that uses a pistol to deal physical damage to enemies at range.

Reload

LvEffect
1Max bullets: 3. Basic attack/counter consumes 1 bullet. At the start of your team's turn, if bullets are 0, load Magic Bullet to max. Attacks that consume a bullet gain +5% critical hit chance. (Magic Bullet:: If consumed to deal damage, deal additional magic damage equal to 25% of attack power to that target. Can attack or use skills even with no bullets.)
2Max bullets: 3. Basic attack/counter consumes 1 bullet. At the start of your team's turn, if bullets are 0, load Magic Bullet to max. Attacks that consume a bullet gain +10% critical hit chance.

Agent Tier 2 A skilled gunslinger who fights by creating advantageous situations through swift movement.

Agility

LvEffect
1Max bullets: 3. Basic attack/counter consumes 1 bullet. At the start of your team's turn, if bullets are 0, load Magic Bullet to max. Attacks that consume a bullet gain +20% critical hit chance. (Magic Bullet:: If consumed to deal damage, deal additional magic damage equal to 25% of attack power to that target. Can attack or use skills even with no bullets.)
2Max bullets: 3. Basic attack/counter consumes 1 bullet. At the start of your team's turn, if bullets are 0, load Magic Bullet to max. Attacks that consume a bullet gain +25% critical hit chance.

L.T.K Tier 3 An advanced class that can flexibly eliminate both multiple targets and single targets with stylish movement.

Perfect Shot

LvEffect
1Max bullets: 3. Basic attack/counter consumes 1 bullet. At game start, gain the Perfect Shot 1 effect. At the start of your team's turn, if bullets are 0, load Magic Bullet to max. On enemy kill, gain 1 TP and gain the Perfect Shot 1 effect. (Magic Bullet:: If consumed to deal damage, deal additional magic damage equal to 25% of attack power to that target. Can attack or use skills even with no bullets.) (Perfect Shot 1: Cannot be removed: Attack power/critical hit chance +20%. This effect is removed when you take damage.)
2Max bullets: 3. Basic attack/counter consumes 1 bullet. At game start, gain the Perfect Shot 2 effect. At the start of your team's turn, if bullets are 0, load Magic Bullet to max. On enemy kill, gain 1 TP and gain the Perfect Shot 2 effect. (Magic Bullet:: If consumed to deal damage, deal additional magic damage equal to 25% of attack power to that target. Can attack or use skills even with no bullets.) (Perfect Shot 2: Cannot be removed: Attack power/critical hit chance +25%. This effect is removed when you take damage.)

Unique Classes

Overrider Tier 2 A special class that uses a pistol to infiltrate system flaws and overturn the common sense of battle.

  • Error Stack 1: Max bullets: 3. Basic attack/counter consumes 1 bullet. At the start of your team's turn, if bullets are 0, load Magic Bullet to max. Apply Error Stack 1 effect to enemies you damage.
  • Magic Bullet: If consumed to deal damage, deal additional magic damage equal to 25% of attack power to that target. Can attack or use skills even with no bullets.
  • Error Stack 1 (stack 10 / duration 2): Attack power/spell power -3%. Received penetration damage +5%. When attacked, this effect's stacks and duration increase by 1. This effect is treated as a buff.
  • Perfect Shot 2: Max bullets: 3. Basic attack/counter consumes 1 bullet. At the start of your team's turn, if bullets are 0, load Magic Bullet to max. Apply Error Stack 2 effect to enemies you damage.
  • Error Stack 1 (stack 10 / duration 2): Attack power/spell power -4%. Received penetration damage +5%. When attacked, this effect's stacks and duration increase by 1. This effect is treated as a buff.

Root Hacker Tier 3 An advanced class that uses a pistol to corrupt the system's core rules and erode enemies.

Paradox Worm

LvEffect
1Max bullets: 3. Basic attack/counter consumes 1 bullet. At the start of your team's turn, if bullets are 0, load Magic Bullet to max. When attacking enemies, damage dealt to the target increases by 5% per enemy buff. Gain Paradox Worm effect on enemies you damage. (Magic Bullet:: If consumed to deal damage, deal additional magic damage equal to 25% of attack power to that target. Can attack or use skills even with no bullets.) (Paradox Worm: (stack 10 / duration 2): Attack power/spell power -5%. Received penetration damage -10%. When attacked, this effect's stacks and duration increase by 1. This effect is treated as a buff.)
2Max bullets: 3. Basic attack/counter consumes 1 bullet. At the start of your team's turn, if bullets are 0, load Magic Bullet to max. When attacking enemies, damage dealt to the target increases by 10% per enemy buff. Gain Paradox Worm effect on enemies you damage.

Chaos Blinger Tier 3 An order-destroyer who uses a pistol and spreads chaos across the battlefield.

Digital Pandemic

LvEffect
1Max bullets: 3. Basic attack/counter consumes 1 bullet. At the start of your team's turn, if bullets are 0, load Collapse Bullet to max. When attacking enemies, increase damage the target takes by 10% per enemy debuff until end of turn. After attacking, if the target has a removable debuff, copy a debuff to 1 nearby enemy within 3 tiles. (Collapse Bullet: Darkness: If consumed to deal damage, deal additional magic damage equal to 25% of attack power to that target and apply a random debuff and Collapse. Can attack or use skills even with no bullets.) (Collapse: Darkness (duration 2): When attacked, explode dealing dark fixed damage equal to 25% of caster's attack power within a 1-tile radius.)
2Max bullets: 3. Basic attack/counter consumes 1 bullet. At the start of your team's turn, if bullets are 0, load Collapse Bullet to max. When attacking enemies, increase damage the target takes by 15% per enemy debuff until end of turn. After attacking, if the target has a removable debuff, copy a debuff to 1 nearby enemy within 3 tiles.

Skills

Common Skills

SkillTPRangeCDEffect
Suppressing Fire Ranged Directional Combat12-42 turnsConsumes 1 bullet. Fire at an enemy dealing 120% of attack power as damage and apply Suppress for 1 turn. • Suppress Skill Control (stack 1): Cannot gain TP.
Armor-Piercing Reload1Self3 turnsImmediately after using this skill, you can take an additional attack or use a skill. Empty all remaining bullets and load Armor-Piercing Bullet to max. • Armor-Piercing Bullet: If consumed to deal damage, deal additional physical fixed damage equal to 25% of attack power to that target and remove 1 TP. Can attack or use skills even with no bullets.
Double Down Ranged Directional Combat22-43 turnsConsumes 2 bullets. Fire at an enemy dealing 80% of attack power as damage. Fire one more shot dealing 50% of attack power as damage.
Tactical Maneuver TP Removal11-13 turnsChoose a direction and move up to the farthest empty tile within 4 tiles ahead, stealing TP. If the TP stolen is 0, you get the TP back and this skill's cooldown decreases by 1. Immediately after using this skill, you can take an additional attack or use a skill. #### Unique Skills
Override Field1Self2 turnsImmediately after using this skill, you can take an additional attack or use a skill. Gain the Override Field effect for 2 turns. • Override Field Cannot be removed (duration 2): Ignore elemental advantage/disadvantage. Ignore attack/defense-type advantage/disadvantage. Damage you deal to all enemies increases by 50% as if you had advantage, and damage you take decreases by 50%.
Terminal Protocol Ranged Combat12-42 turnsConsumes 1 bullet. Deal 140% of attack power to an enemy, plus an additional 20% of attack power per buff the target has. This skill is not affected by cover and cannot be guarded against. If the enemy is not killed by this skill, banish it for 1 turn. • Banish Cannot be removedAction ControlBanish (duration 1): Unaffected by normal damage, skills, or effects, and cannot act.
Astral Blade Electric Ranged Directional31-13 turnsChoose a direction and deal 90% of attack power to enemies in range and inflict Shock. Additionally apply 1 random effect from Collapse, Daze, Suppress, or Banish. • Collapse Darkness (duration 2): When attacked, explode dealing dark fixed damage equal to 25% of caster's attack power within a 1-tile radius. • Shock Action ControlElectric (duration 2): Cannot counter. • Daze Action ControlMovement Control (duration 2): Movement -2. Cannot take additional movement or additional actions. Cannot guard. • Suppress Skill Control (duration 1): Cannot gain TP. Lasts 1 turn. • Banish Cannot be removedAction ControlBanish (duration 1): Unaffected by normal damage, skills, or effects, and cannot act.
Null Spread Ranged Directional21-13 turnsConsumes all bullets. Empty all remaining bullets and load Magic Bullet to max. Choose a direction and fire at any targetable enemy in a straight line within range, dealing 30% of attack power as damage. Repeat until all bullets are consumed or the enemy is killed. ---

Ultimate

Unreal Black Hole Ultimate Darkness Ranged Position Control

Quote: "There's nothing left for me in this world...! Cosmos data hack complete. Transmitting target data! You won't survive...! Disappear!!"

TierEffect
First AcquisitionOn use, lose 50% of remaining HP and gain 10% increased attack power until the start of your next turn. Target a location and deal 100% of attack power to enemies within a 3-tile radius around the target, pulling them toward the center.
Max AwakeningOn use, lose 50% of remaining HP and gain 25% increased attack power until the start of your next turn. Target a location and deal 120% of attack power to enemies within a 3-tile radius around the target, pulling them toward the center.
Max ManifestationOn use, lose 50% of remaining HP and gain 50% increased attack power until the start of your next turn. Target a location and deal 150% of attack power to enemies within a 3-tile radius around the target, pulling them toward the center. • Cost: TP 5 | Range: 1-4 | Area: AoE | Cooldown: 5 turns

Manifestation Skill - Outer One

Entropy Ghost Penetration

TierEffect
First AcquisitionOn use, lose 10% of max HP. Enter Entropy Ghost state.
Max ManifestationOn use, lose 10% of max HP and recover 1 TP. Remove all debuffs on yourself and enter Entropy Ghost state. • Entropy Ghost Cannot be removed Action Control (duration 1): Can attack enemies in Banish or Phase Leap state. This effect is treated as an action-control and Banish state, and cannot be targeted by skills or effects. • Cost: TP - | Range: Self | Area: AoE | Cooldown: 4 turns

Manifestation Artifacts

Overload Loader More! Stronger! Enhances the wearer's firearm to neutralize enemy defenses and load more bullets.

LvEffect
1Physical penetration +15%. Max bullets +1.
2Physical penetration +30%. Max bullets +1.
3Physical penetration +45%. Max bullets +1.
4Physical penetration +60%. Max bullets +1.

Initial Armor-Piercing Magazine Prepares the wearer in optimal condition to gain a strong advantage from the opening engagement.

LvEffect
1Start the game with Armor-Piercing Bullet loaded. Armor-Piercing Bullet: If consumed to deal damage, deal additional physical fixed damage equal to 25% of attack power to that target and remove 1 TP. Can attack or use skills even with no bullets.
2Critical hit chance +10%. Start the game with Armor-Piercing Bullet loaded.
3Critical hit chance +20%. Start the game with Armor-Piercing Bullet loaded.
4Critical hit chance +30%. Start the game with Armor-Piercing Bullet loaded.

Wind Step Makes the wearer's steps as light as the wind, improving movement speed and causing enemies' critical attacks to miss.

LvEffect
1At end of action, gain Wind Step 1 effect. Wind Step 1: Movement +1 (does not stack). Received critical hit chance -10%. Max 2 stacks. Removed after being attacked.
2At end of action, gain Wind Step 2 effect. Wind Step 2: Movement +1 (does not stack). Received critical hit chance -15%. Max 2 stacks. Removed after being attacked.
3At end of action, gain Wind Step 3 effect. Wind Step 3: Movement +1 (does not stack). Received critical hit chance -20%. Max 2 stacks. Removed after being attacked.
4At end of action, gain Wind Step 4 effect. Wind Step 4: Movement +1 (does not stack). Received critical hit chance -25%. Max 2 stacks. Removed after being attacked.

Sunset Pendant (Exclusive) A sunset-colored pendant that Heidelun keeps close to her chest. Thanks to the sparkling crimson gem in the center, it looks like a burning sunset.

  • HP +30%. If you have a shield, physical penetration increases by 30% and you gain Cover state. At the start of your team's turn, if HP is 50% or below, gain Safety Barrier effect equal to max HP for 2 turns. (Cooldown 2)
  • Cover: Cannot be critically hit by enemy directional attacks, and misses occur reducing damage taken by 50%.
  • Safety Barrier: HP-proportional shield. Cannot be removed.

Exclusive Weapon

Weapon SkillEffect
Ex Nihilo [Max Awakening]The pistol used by the captain of the last Adellun. It absorbs the user's spirit particles to unleash overwhelming destructive power, and if the recoil cannot be withstood, it can self-destruct. When Heidelun equips it, the weapon's potential can be drawn out. • Grade: Outer One | Type: Pistol | Exclusive Character: Heidelun

Stats: Max HP +122, Attack Power +382 Additional Stats: Attack Power +20%, Critical Hit Chance +20%

Weapon SkillEffect
Aftershock (Heidelun exclusive)At game start, the wearer's max bullet count increases by 2. After attacking, apply Kill Order 6 to 2 random enemies among those damaged, and gain Aftershock 6. When an enemy is killed by the Aftershock 6 effect, Aftershock 6 triggers one more time. • Kill Order 6: Received critical damage +20%. When taking fatal damage, the enemy that dealt the damage gains 1 TP and this effect is removed. Lasts 2 turns. • Aftershock 6: At end of character's turn, fire at the lowest-HP enemy in range dealing 80% of attack power as damage. Aftershock 6 triggers even with no bullets.
Kill Order (normal skill)After attacking, apply Kill Order 6 to 1 random enemy among those damaged. (Cooldown 1 turn) --- • Kill Order 6: Received critical damage +20%. When taking fatal damage, the enemy that dealt the damage gains 1 TP and this effect is removed. Lasts 2 turns.

Awakening

Manifestation resource: Error Cube.

Stage

LvEffect
1Gain Entropy Ghost. Ultimate Enhancement 1.
2Passive Enhancement 1. Stat Enhancement.
3Active Enhancement 1. Artifact acquired: Overload Loader, Initial Armor-Piercing Magazine, Wind Step. Ultimate Enhancement 2.
4Passive Enhancement 2. Artifact Enhancement 1.
5Active Enhancement 2. Artifact Enhancement 2. Ultimate Enhancement 3.
6Passive Enhancement 3. Artifact Enhancement 3. Exclusive Artifact acquired: Sunset-Light Pendant.

Artifacts

Overload Loader: "More! Stronger! Enhances the wearer's firearm to nullify enemy defense and load more bullets."

LvEffect
1Physical Penetration +15%. Max bullets +1.
2Physical Penetration +30%. Max bullets +1.
3Physical Penetration +45%. Max bullets +1.
4Physical Penetration +60%. Max bullets +1.

Initial Armor-Piercing Magazine: "Prepares the wearer in optimal condition to gain a strong advantage from the very first engagement." Initial AP Magazine

LvEffect
1Start the game with AP Bullet loaded. AP Bullet: if consumed to deal damage, deals additional physical fixed damage equal to 25% of attack to that target and removes 1 TP. Can attack or use skills even without bullets.
2Crit Rate +10%. Start the game with AP Bullet loaded.
3Crit Rate +20%. Start the game with AP Bullet loaded.
4Crit Rate +30%. Start the game with AP Bullet loaded.

Wind Step: "Makes the wearer's steps light as wind, increasing movement speed and causing enemy critical attacks to miss."

LvEffect
1On action end, gain Wind Step 1 effect. (Wind Step 1: Movement +1 (does not stack). Received Crit Rate -10%. Max 2 stacks. Removed after being attacked.)
2On action end, gain Wind Step 2 effect. (Movement +1 (does not stack). Received Crit Rate -15%. Max 2 stacks. Removed after being attacked.)
3On action end, gain Wind Step 3 effect. (Movement +1 (does not stack). Received Crit Rate -20%. Max 2 stacks. Removed after being attacked.)
4On action end, gain Wind Step 4 effect. (Movement +1 (does not stack). Received Crit Rate -25%. Max 2 stacks. Removed after being attacked.)

Sunset-Light Pendant [exclusive]: "A sunset-light pendant Heidelloon keeps deep in his bosom. The scarlet gem in its center glitters, making it look like a burning sunset."

  • HP +30%. If holding a shield, Physical Penetration increases by 30% and gains Cover state. At ally turn start, if HP is 50% or below, gain Safety Barrier effect equal to max HP for 2 turns. (Cooldown 2)
  • Cover: Cannot be crit by enemy directional attacks; glancing hits occur, reducing received damage by 50%.
  • Safety Barrier: HP-proportional shield. Cannot be removed.

Signature Gear

Ex Nihilo
Ex Nihiloweapon · Pistol · Outer One · Heidelun exclusive

The pistol used by the last captain of Adelun. It absorbs the user's spiritual energy to unleash overwhelming destructive power, and can self-destruct if the recoil cannot be withstood. When equipped by Heidelun, the weapon's full potential is unleashed.

Stats
Max HP +122, Attack +382
Additional
Attack +20%, Critical Hit Chance +20%

Aftershock (Heidelun exclusive). At the start of the game, max ammo +2. After attacking, apply Kill Order 6 to 2 random enemies you damaged and gain Aftershock 6. If you kill an enemy while you have Aftershock 6, Aftershock 6 triggers once more.

  • Kill Order 6: Received critical damage +20%. If the target takes lethal damage, the enemy who dealt it gains 1 TP and this effect is removed. Lasts 2 turns.
  • Aftershock 6: At the end of your turn, fire at the lowest-HP enemy in range for 80% of Attack. Triggers even with no ammo.

Kill Order (Normal Skill). After attacking, apply Kill Order 6 to 1 random enemy you damaged. (Cooldown 1 turn)

  • Kill Order 6: Received critical damage +20%. If the target takes lethal damage, the enemy who dealt it gains 1 TP and this effect is removed. Lasts 2 turns.
System Heretic Setarmor · Medium · Outer One

Heidelun's self-motif Outer One armor set (paid).

2-set: Physical Penetration +15%, Critical Chance +15%.

4-set: On attacking an enemy, Attack +30%; when dealing lethal damage, once per turn gain a shield equal to 50% of Max HP for 2 turns.

Note. No accessory or rune is exclusive to Heidelun; the guide recommends the Ancient Hero's Ring accessory for attack-power scaling.

Release Date

Original Korean release: 2025-07-08. Released for the 1.5th anniversary as the 2nd Outer One.

Estimated global release: 2026-12-09.

Guide

Overall: An even stronger but more fragile ultra-burst glass cannon. A more extreme upgrade of Christian: durability got even more frail while firepower got even stronger, and with a single skill click he can gain type advantage against all attributes/troop types, greatly increasing solo-all-kill potential. Depending on class choice he can be run as an extreme counter to buff-stacking parties, or actively apply debuffs for equivalent returns, allowing flexible operation. Achieving Manifestation 1+ lets him actively enter the "Entropy Ghost" state, projecting overwhelming firepower one-sidedly while invincible (even if only for 1 turn), which is extremely powerful. A high-Manifestation, high-awakening exclusive-weapon Heidelloon in the arena can Ghost -> Tactical Maneuver for TP 2 -> Blackhole to slash the whole party's HP, then sweep with follow-up Aftershock, and even if the opponent survives, he is in Entropy Ghost state so nothing can touch him unless it is another Entropy Ghost Heidelloon. Everything (awakening/manifestation, weapon awakening, exclusive armor) is designed so he grows honestly in proportion to money spent; judge the right line for yourself.

Passive: A passive that forces him to be a glass cannon. Heidelloon has enormous attack plus a Christian-era trait that attacks again on enemy kill, so the Entropy Ghost state (which secures survival and crit rate at once) is very strong. He can attack banished/Entropy Ghost enemies, so in PVP it is the only way to kill an enemy Entropy Ghost Heidelloon. Absolutely avoid raising his HP and defense. Manifestation adds attack boost and converts the Banish state into Entropy Ghost, letting him counter Diablo's Phantom Walk, Joan's bind, etc. In high-difficulty dungeons (challenges, late simulation training) where enemy gunners fire banish-bullets, a high-Manifestation Heidelloon becomes stronger when banished, so he counters banish-bullet gunners.

Classes: The Tier-3 options are Root Hacker (buff counter), Chaos Blinger (debuff counter), and L.T.K. Root Hacker is recommended as 1st-priority raise and endgame class: its Paradox Worm (buff-treated debuff, max 10 stacks) applies easily (2 stacks per hit, ~4 stacks in 1 turn with the exclusive weapon's double attack), and its damage-amp scales with buff count so Paradox Worm counts toward it too; its "penetration damage taken" increase also supports penetration-type allies (i.e. Joan). Warning: synergy with Black Prince's Atomic Blast (which wipes buffs and blocks new buff gain) is the worst, since Paradox Worm is a removable buff and cannot be applied to enemies under the Despair debuff; Isabel's exclusive Longinus can also wipe buffs from 5-awakening, and buff-steal units like Silver can steal this debuff, so combine carefully. Chaos Blinger is the debuff counter: actively applies many debuff types, fires Collapse Bullet for area dark damage, and its contagion spreads debuffs, so it excels vs Fierce-Battle Raid / World Boss Raid (debuff-heavy, buff-scarce) and synergizes well with Black Prince's Death Lord (which spreads Loss-of-Will debuffs). L.T.K. (max bullets 4, only class with base movement 4, most mobile) starts stages with the infinite "Perfect Shot" buff (+25% attack/crit at max) and gains 1 TP on kill, but the buff evaporates on taking any damage, so it is weak in raids like Cerberus/Diene where you cannot kill and cannot avoid damage; lowest raise priority since Root Hacker has better damage-amp and a separate class tree.

Core skills & Ultimate:

  • Override Field: TP 1, gain the unremovable 2-turn buff granting type-advantage vs all enemies (+50% damage dealt, -50% damage taken), plus a follow-up action; cooldown 2. Called a "balance-breaking" skill.
  • Terminal Protocol (main damage skill 1): TP 2, 1 bullet, 140% + 20% per enemy buff, ignores cover/escort, banishes if it fails to kill; cooldown 3. Great with Entropy Ghost (can follow up).
  • Astral Blade: TP 3, 3x5 area, 90% electric damage + Shock + 1 random debuff; cooldown 3. Does not consume bullets (so no Magic-Bullet/Collapse-Bullet amp), random debuffs, but wide range helps his poor mobility; good class-passive synergy for Chaos Blinger (applies 2 debuffs).
  • Null Spread (main damage skill 2): TP 2, empties all bullets and reloads Magic Bullets to max, then fires down a straight line at 30% per shot (each shot's real multiplier becomes 55% with Magic Bullet, so ~155% start), repeating until bullets run out or enemy dies; cooldown 3. With L.T.K. + exclusive weapon (6-bullet magazine, full awakening) the peak reaches 430%; but only ~220% on other classes with a stand-in weapon, sometimes weaker than Terminal Protocol. Cannot fire Collapse Bullets via Null Spread.
  • Tactical Maneuver: TP 1, move to farthest empty cell within 4 front cells, steal TP from passed enemies (if 0 stolen, refunded and cooldown -1), plus follow-up action; cooldown 3. Useful for his slow (movement 3) main classes; with TP steal, a 1-turn instant Blackhole is possible if 3 enemies are lined up.
  • Unreal Blackhole (Ultimate): dark area attack targeting within 4 cells; on use lose 50% of remaining HP and gain +15% attack until next turn start, then deal 100%~120% damage to enemies within 3 rings around the target and pull them to center (position control). Wide range, all passives apply, first-strike boost. Risky (halves HP, blocks passive-trigger condition), so normally use carefully; but firing while in Entropy Ghost is near no-risk since invincible, and after obtaining the manifestation skill he can fire it freely; full-manifestation drops the passive condition to 50% so HP loss barely matters. Grows in power/convenience the more you pay.
  • Manifestation skill Entropy Ghost: no TP, pays 10% HP to grant self Entropy Ghost; triggers Sequence Break for a re-action. First enhance adds debuff removal, second enhance adds 1 TP charge; cooldown 4. Effectively pays HP for 1-turn invincible + crit rate, lasting until end of the next turn's action (up to 2 Ghost attacks) plus a re-action. In PVP (as of mid-2025) the only counter to a Manifestation-1+ Heidelloon is another Manifestation-1+ Heidelloon, so this skill is considered essential for active PVP players.

Exclusive weapon & recommended gear: Weapon is Ex Nihilo; extra stats attack + crit, max bullets +1~2.

  • Kill Order: applied to a random hit enemy after attacking; received crit damage +10~20%; if that enemy takes lethal damage, the dealer gains 1 TP and Kill Order is removed; lasts 2 turns. 1 target, becomes 2 from 5-awakening.
  • Aftershock (Heidelloon-exclusive): on action end, fire at the lowest-HP enemy in range for 50~80% damage; triggers even without bullets; if it kills, Aftershock triggers once more (no cap on repeats, theoretically can wipe all enemies in 1 turn). Essentially mandatory; awakening's crit-multiplier rise contributes greatly to firepower. Note: Aftershock is not an "extra attack," so whetstones are meaningless.
  • Armor: Ignore survival entirely, go full-burst; unlike Christian there is no crit benefit and most is attack-multiplier, so pile everything into attack. Best Legendary armor is the Assassin 4-set; One-Man-Army 4-set + physical penetration can counter PVP crit-damage-reduction tank meta. Heroic: Chivalrous 4-set, or Chivalrous 2 + Slayer 2 for attack 20%. The self-themed "System Heretic" set (2-set: physical pen 15% + crit 15%; 4-set: attack +30% on enemy attack, plus once-per-turn 2-turn shield of 50% max HP on dealing lethal damage) is a broken paid-item set worth considering if wealthy.
  • Accessories: attack-focused, so the standard Ancient Hero's Ring is recommended (though it slightly raises survival, making passive-trigger a bit harder). Arrowhead valid if crit + Terminal Protocol focus, but note it does not apply to Null Spread. Heroic: Wound-Worsening Charm for attack, or Golden Dice for crit. Fang usable for attack but physical pen applies only to combat attacks, so unsuitable if Astral Blade/Null Spread are main; whetstones meaningless since Aftershock is not an extra attack.

No explicit S/A/B tier letter rating is present in the text.

Trivia

Stats, skills, and art for Heidelun are translated and adapted from its NamuWiki page, licensed under CC BY-NC-SA 2.0 KR. Genesis War Mobile: Asura Project and its characters are property of their respective rights holders.