From Brotato Wiki
29900 HP (Danger 0-4)
31395 HP (Danger 5)
200 (M0 and M1) 500 (M2) Speed
19.5 (M0 and M1) 73 (M2) Damage
Winning the game (D1-4)
It's no longer a threat (D5)
Bosses
Bosses are special enemies that only appear on wave 20. Only one boss will spawn in dangers 0-4 but both will spawn in danger 5. These are the most powerful type of enemy with 29900 base health. You win the Run when all bosses are dead, or after the 90 second timer has passed.
Just like elites they can't be buffed by the buffer enemy.
Mutation 0 (M0)
(initial phase)
Every two seconds creates a area of projectiles around the players that spawn after a second of priming.
Mutation 1 (M1)
(At 60% hp or after 30s)
More projectiles spawn in a much wider area around the player.
Mutation 2 (M2)
(At 40% HP or after 60s)
Speed increases by 150% (from 200 to 500), runs all around the area and creates a circle of projectiles around the player.