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Prototype EX-78

By Sevih · Updated Sep 23, 2026

Joint Challenge boss. The boss prioritizes the leftmost enemy, and if the target isn't a Healer, it gains . Increased damage from Earth and Water enemies. Takes 100% increased WG damage from .

Difficulty

Prototype EX-78

Prototype EX-78

Lv. 120

Immunities

5,000Attack
0Defense
2,000,000Health
250Speed
10%Crit Chance
150%Crit DMG
0%Crit DMG Reduc
0%Penetration
18%DMG Increase
18%DMG Reduction
168Effectiveness — Sheet value: 210 (before passives)
168Resilience — Sheet value: 210 (before passives)
WG60WG

Lv. 120 — Joint Challenge · Defeat Prototype EX-78 Very Hard

Skills

Guardian Slash

Single Target

Attacks an enemy. Prioritizes the enemy on the far left, and if the target is not a Healer, grants the caster an irremovableReduced Damage effect for 1 turns.

Guardian Cutter

CD 4All Enemies

Attacks all enemies, and grants increased Critical Hit Chance and Critical Damage to the caster for 3 turn(s).

Electric Cannon

CD 4All Enemies

Attacks all enemies. Grants Reduced Defense and Reduced Attack for 5 turns. (Ignores Immunity) Right after using this skill, does not trigger an enemy's Counterattack, Revenge, or Agile Response.

Kill Mode

(Passive Effect) Increases damage received from Water and Earth enemies, and decreases damage received from Fire, Light, and Dark enemies. When the caster is afflicted with Poisoned, damage received increases. When attacked by an enemy with a debuff, the enemy's CP is reduced by 30.

Battle Command

(Passive Effect) After attacking, if the caster has a removable Buff, recovers 10% of WG. Takes 100% increased WG damage from Dual Attacks. Damage from Fixed Damage cannot exceed 80000. All attacks deal increased damage the fewer enemies there are.

Enraged

Single Ally

Becomes Enraged every 4 turns. Enraged: Grants an irremovable effect to the caster that increases Attack and reduces damage taken for 3 turns. Recovers 30% Weakness Gauge. Enraged lasts for 3 turns. Stun Cannon: Used when Enraged ends. Attacks all enemies. Has a 100% chance to inflict Stunned on the target for 2 turn(s), then permanently grants irremovable increased Critical Hit Chance to the caster. The Stunned effect ignores the target's Resilience.

Tips and teams below are written for Very Hard.

Tactical Tips

  • S1 prioritizes the leftmost enemy - place a Healer to prevent buff.
  • Increased damage from Earth and Water, reduced from Fire, Light, Dark.
  • Takes increased damage when afflicted with .
  • When attacked by debuffed enemy, reduces their CP by 30.
  • If boss has a dispellable buff, recovers 10% WG after attacking.
  • Takes 100% increased WG damage from .
  • Try to make your Luna faster than the boss to inflict before it uses S2.

Recommended Characters

LunaViella

Luna, Viella

Essential pick for score bonus.

Monad EvaVeronicaPrimine

Monad Eva, Veronica, Primine

Alternative with .

DianneSaeran

Dianne, Saeran

support if needed.

AmeReyNoaRyu LionHeatwave Cop Delta

Ame, Rey, Noa, Ryu Lion, Heatwave Cop Delta

Earth DPS options.

TamaraCharlotte

Tamara, Charlotte

Support options.

Suggested Teams

Place a Healer on the leftmost position to prevent the boss from gaining . Earth and Water DPS deal increased damage.

Combat Footage

Prototype EX-78 — Very Hard — 1 run clearby Sevih