Stories of Legend · Stage 6
Underground
アンダーワールド
Underground is a Battle Cats stage in Stairway to Darkness. It costs 125 energy and sends 14 enemy spawn lines — led by Bun Bun Black as the boss — against a 330,000 HP enemy base, and clearing it rewards 100,462 XP. Its enemies carry the Black, Red, Angel and Floating traits, so cats that target them do the most work here.
Data updated: 2026-08-31
125Energy Cost
100,462XP Reward
330,000Enemy Base HP
5,200Stage Length
6Max Enemies
8.2Difficulty
Enemy spawns (14)
| Enemy | Strength | Count | First Spawn | Respawn | Base HP Trigger | Notes |
|---|---|---|---|---|---|---|
 Shadow Boxer K | 100% | 3 | 12s | 8s~20s | 100% | — |
 Ginger Snache | 100% | 15 | 0s | 0.3s~6s | 100% | — |
| Ginger Snache | 100% | ∞ | 0s | 10s~20s | 100% | — |
 Gabriel | 100% | ∞ | 33.3s | 16.7s~26.7s | 100% | — |
 Squire Rel | 1200% | ∞ | 0s | 2s~6s | 90% | — |
| Gabriel | 100% | ∞ | 0.1s | 8s~20s | 90% | — |
 Heavenly Hippoe | 100% | ∞ | 0s | 8s~20s | 90% | — |
 J.K Bun Bun | 400% | 1 | 0s | — | 90% | — |
| Squire Rel | 800% | 10 | 0s | 0.1s | 90% | — |
 Teacher Bun Bun | 1100% | 1 | 0s | — | 90% | — |
| Squire Rel | 800% | 10 | 0s | 0.1s | 90% | — |
 Bun Bun Black | 400% | 1 | 0s | — | 90% | Boss |
| Squire Rel | 800% | 5 | 0s | 0.1s | 90% | — |
 Ms. Sign | 2000% | ∞ | 900s | 900s | 100% | — |