Special Stages · Stage 2

Aku Studies 401: Methods

悪魔研究Ⅳ方法

Aku Studies 401: Methods is a Battle Cats stage in Empress' Report 4. It costs 100 energy and sends 10 enemy spawn lines — led by Squire Rel as the boss — against a 850,000 HP enemy base, and clearing it rewards 8,930 XP. Its enemies carry the Aku trait, so cats that target it do the most work here.

Data updated: 2026-08-31

100Energy Cost
8,930XP Reward
850,000Enemy Base HP
5,400Stage Length
12Max Enemies
9.4Difficulty
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Cats that counter Aku Studies 401: Methods

Cats whose attacks target Aku, best DPS first — the traits this stage’s enemies actually carry:

Thunder JackLovestruck Lesser DemonBunny & CanardDaybreaker IzanagiMighty Rekon KorpsCake Machine

Stage rewards

100% — Catseye [Legend] ×1 · first clear

Enemy spawns (10)

EnemyStrengthCountFirst SpawnRespawnBase HP TriggerNotes
Duche1000%106.7s20s~26.7s100%—
Squire Rel100%113.3s—100%Boss
Croakley100%213.3s63.3s~70s100%—
Squire Rel4000%∞16.7s10s~13.3s100%—
Miz Devil300%∞20s16.7s~23.3s100%—
Aku Doge500%1233.3s26.7s~30s100%—
Aku Gory200%553.3s36.7s~40s100%—
Aku Gory200%3120s20s~26.7s100%—
Miz Devil300%15133.3s6.7s~13.3s100%—
Ms. Sign100%∞900s900s100%—
All Empress' Report 4 stages