Collaboration Stages · Stage 1
A City Aflame (Insane)
都炎上 超激ムズ
A City Aflame (Insane) is a Battle Cats stage in Merc Storia: Inferno. It costs 150 energy and sends 13 enemy spawn lines — led by Healer (Enemy) as the boss — against a 900,000 HP enemy base, and clearing it rewards 21,150 XP. Its enemies carry the Black and Floating traits, so cats that target them do the most work here.
Data updated: 2026-08-31
150Energy Cost
21,150XP Reward
900,000Enemy Base HP
5,200Stage Length
5Max Enemies
7.2Difficulty
Enemy spawns (13)
| Enemy | Strength | Count | First Spawn | Respawn | Base HP Trigger | Notes |
|---|---|---|---|---|---|---|
 Doge Dark | 200% | 10 | 3.3s | 5.3s~16.7s | 100% | — |
 Rei (Enemy) | 400% | 2 | 40s | 6.7s | 100% | — |
 Wyvern (Enemy) | 100% | 1 | 0.1s | — | 50% | — |
| Rei (Enemy) | 100% | 1 | 0.1s | — | 50% | — |
 Fuu (Enemy) | 400% | ∞ | 126.7s | 40s~53.3s | 100% | — |
 Serum (Enemy) | 600% | ∞ | 6.7s | 30s~36.7s | 100% | — |
| Rei (Enemy) | 400% | ∞ | 113.3s | 30s~43.3s | 100% | — |
| Rei (Enemy) | 400% | 3 | 113.3s | 0.1s~1.3s | 100% | — |
| Serum (Enemy) | 600% | 3 | 113.3s | 0.7s~3.3s | 100% | — |
| Wyvern (Enemy) | 100% | 1 | 40s | — | 100% | — |
| Wyvern (Enemy) | 100% | 1 | 120s | — | 100% | — |
 Healer (Enemy) | 400% | 1 | 113.3s | — | 100% | Boss |
 Ms. Sign | 1200% | ∞ | 900s | 900s | 100% | — |