Yeti Mosquito

On arrival the Yeti was called impossible to approach because of its size. Advice in the session was to survive at least one hit. At roughly 150,000 player health its attacks stopped mattering. A different attempt bought the 1,000 Robux spray instead. No filmed cash-only clear is written down, so neither path is proven to be the only one.

The next boss after the sword-carrying mosquito in the filmed lineup.

If you are not spending Robux, the only documented preparation is an extremely high health pool from the seat chain. If the hits still delete you, you are earlier than this fight.