Gauntlets · Stage 21

Steel Frontier

硬き本能の秘境

Steel Frontier is a Battle Cats stage in Island of Hidden Treasure. It costs 300 energy and sends 3 enemy spawn lines against a 900,000 HP enemy base, and clearing it rewards 26,790 XP. Its enemies carry the Metal trait, so cats that target it do the most work here.

Data updated: 2026-08-31

300Energy Cost
26,790XP Reward
900,000Enemy Base HP
5,500Stage Length
12Max Enemies
9.4Difficulty
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Cats that counter Steel Frontier

Cats whose attacks target Metal, best DPS first — the traits this stage’s enemies actually carry:

Lovestruck Lesser DemonDaybreaker IzanagiMighty Rekon KorpsGude-Cat MachineAgent StaalKing of Doom Phono

Stage rewards

73% — 減輕傷害 D: 鋼 ×120% — 減輕傷害 C: 鋼 ×16% — 減輕傷害 B: 鋼 ×11% — 減輕傷害 A: 鋼 ×1

Enemy spawns (3)

EnemyStrengthCountFirst SpawnRespawnBase HP TriggerNotes
Sir Metal Seal300%26.7s40s100%—
Sir Metal Seal300%283.3s33.3s100%—
Ms. Sign100%∞900s900s100%—
All Island of Hidden Treasure stages