Special Stages · Stage 3
Aku Studies 501: Field Research
悪魔研究Ⅴ発見
Aku Studies 501: Field Research is a Battle Cats stage in Empress' Report 5. It costs 100 energy and sends 10 enemy spawn lines — led by Medu-san as the boss — against a 999,999 HP enemy base, and clearing it rewards 8,930 XP. Its enemies carry the Floating, Relic, Zombie and Aku traits, so cats that target them do the most work here.
Data updated: 2026-08-31
100Energy Cost
8,930XP Reward
999,999Enemy Base HP
5,400Stage Length
12Max Enemies
10.2Difficulty
Enemy spawns (10)
| Enemy | Strength | Count | First Spawn | Respawn | Base HP Trigger | Notes |
|---|---|---|---|---|---|---|
 Mooth | 4000% | 1 | 3.3s | — | 100% | — |
 Relic Doge | 100% | 3 | 13.3s | 13.3s~16.7s | 100% | — |
 Zoge | 300% | ∞ | 13.3s | 33.3s~36.7s | 100% | — |
| Mooth | 4000% | 3 | 86.7s | 70s~73.3s | 100% | — |
 Aku Doge | 600% | ∞ | 0.1s | 26.7s~30s | 99% | — |
| Relic Doge | 100% | 5 | 0.1s | 23.3s~26.7s | 99% | — |
 Medu-san | 150% | 1 | 0.1s | — | 99% | Boss |
 Li'l Zyclone | 100% | 2 | 0.1s | 60s | 99% | — |
 Cadaver Bear | 300% | 2 | 0.1s | 56.7s | 99% | — |
 Ms. Sign | 100% | ∞ | 900s | 900s | 100% | — |