The Red Cat Gambit

The Red Cat Gambit is the final stage in Coup de Chat.

Battleground
As soon as the battle begins, Othom will be spawned as the first wave. Later, M. Ost will appear as the second wave. Relic Bun-Bun appears as the third wave.

Reference

 * https://battlecats-db.com/stage/s13009.html