Eviledon

Secret rarity is the apex tier of Steal a Brainrot — these spawn under 0.1% chance from the conveyor belt and represent the rarest, most valuable creatures in the game.

Eviledon earns roughly $31.5M/s/sec — fine for early-game padding, marginal once your base hits the upgraded conveyor.

Eviledon entered the Steal a Brainrot roster as part of the broader Italian-brainrot meme cycle that defined the game's identity.

Acquisition is brutal: you'll either spend tens of millions of cash buying through the conveyor (and need luck even with the buy-all setup), pull it from a Secret-only egg or event reward pool, or fuse it from God-tier inputs in the right machine. Most secret brainrots are also locked behind specific events, so missing the window means waiting for a re-release.

Costing $3.8B on the conveyor when it does spawn, Eviledon sits inside the standard cost-per-income window for the secret tier; trade values track that ratio closely on community boards.

Cheap mutations like Gold (1.25x) or Lava (1.5x) are the most economical fits — anything more expensive is overinvestment given the ceiling of this rarity tier.

Use Eviledon as a placeholder while you stack cash for upgrades, then fuse or trade it away once a higher-tier replacement becomes available.