Collaboration Stages · Stage 2
On Holy Wings
聖翼と呼ばれた少女
On Holy Wings is a Battle Cats stage in Merc Storia: Mystery. It costs 60 energy and sends 8 enemy spawn lines — led by Michelia (Enemy) as the boss — against a 30,000 HP enemy base, and clearing it rewards 8,460 XP. Its enemies carry the Floating trait, so cats that target it do the most work here.
Data updated: 2026-08-31
60Energy Cost
8,460XP Reward
30,000Enemy Base HP
3,800Stage Length
6Max Enemies
3.1Difficulty
Enemy spawns (8)
| Enemy | Strength | Count | First Spawn | Respawn | Base HP Trigger | Notes |
|---|---|---|---|---|---|---|
 Orthos (Enemy) | 100% | 1 | 16.7s | — | 100% | — |
 Celesse (Enemy) | 100% | ∞ | 33.3s | 10s~20s | 100% | — |
 Fuu (Enemy) | 100% | 1 | 50s | — | 100% | — |
| Orthos (Enemy) | 100% | 1 | 60s | — | 100% | — |
| Celesse (Enemy) | 100% | 5 | 66.7s | 3.3s~10s | 100% | — |
 Serum (Enemy) | 100% | 3 | 0.1s | 20s | 99% | — |
 Michelia (Enemy) | 100% | 1 | 0.1s | — | 99% | Boss |
 Ms. Sign | 100% | ∞ | 900s | 900s | 100% | — |