Special Stages · Stage 2
Aku Studies 501: Methods
悪魔研究Ⅴ方法
Aku Studies 501: Methods is a Battle Cats stage in Empress' Report 5. It costs 100 energy and sends 11 enemy spawn lines — led by Teacher Bun Bun as the boss — against a 930,000 HP enemy base, and clearing it rewards 8,930 XP. Its enemies carry the Floating and Aku traits, so cats that target them do the most work here.
Data updated: 2026-08-31
100Energy Cost
8,930XP Reward
930,000Enemy Base HP
6,200Stage Length
20Max Enemies
9.5Difficulty
Enemy spawns (11)
| Enemy | Strength | Count | First Spawn | Respawn | Base HP Trigger | Notes |
|---|---|---|---|---|---|---|
 Those Guys | 3000% | 10 | 6.7s | 10s~13.3s | 100% | — |
 Owlbrow | 1000% | 3 | 13.3s | 1s | 100% | — |
| Those Guys | 3000% | 30 | 0.1s | 3.3s~6.7s | 99% | — |
 Sinner Snache | 500% | ∞ | 0.1s | 20s~26.7s | 99% | — |
| Sinner Snache | 500% | 10 | 0.1s | 6.7s~10s | 99% | — |
| Sinner Snache | 500% | 10 | 0.1s | 2s~4s | 99% | — |
 Condemned Peng | 400% | 4 | 0.1s | 20s~23.3s | 99% | — |
| Condemned Peng | 400% | 3 | 0.1s | 13.3s~16.7s | 99% | — |
| Owlbrow | 1000% | 5 | 0.1s | 26.7s~33.3s | 99% | — |
 Teacher Bun Bun | 1800% | 1 | 0.1s | — | 99% | Boss |
 Ms. Sign | 100% | ∞ | 900s | 900s | 100% | — |