

Usually, the posthumous boss looks like the original with some horrible mutilation for example, Monstro and Chub had most of their skin ripped off. Bosses often come in three versions: normal (for example, Monstro), posthumous ( Monstro II), and alternate ( Gish).This means that, for example, Double Trouble boss fights in The Caves can feature bosses from The Cellar or The Basement, and every Double Trouble fight in The Caves can also be encountered in The Catacombs. Double Trouble boss pools can have bosses from previous chapters and can be the same for both versions of that chapter's floor.Originally, every boss and enemy in Binding of Isaac was going to resemble Isaac in some way.10 bosses were added in The Binding of Isaac: Afterbirth, 6 were added in The Binding of Isaac: Afterbirth †, and 30 bosses and 2 mini-bosses were added in The Binding of Isaac: Repentance. In total, there are 102 bosses and 20 mini-bosses. On the other hand, whole-room slowdown and slowing creep, such as that from Stop Watch and Juicy Sack, ignore the immunity and affect bosses like normal enemies.Īdditionally, some floors may spawn a room with a mini-boss. Slowdown-causing items that require the enemy to stay within their area such as Night Light are nearly useless on bosses due to the immunity triggering from the first tick. Once a boss has been inflicted with a status, they become immune to further ones for some time, lasting longer than the initial effect itself. Upon defeat, most bosses will drop an item from the Boss item pool as well as 1-2 Hearts of any kind.īosses boast additional resistances to status effects. After defeating Satan for the first time, bosses may also spawn as champions, which can change various attributes such as health, damage, and attack pattern. The boss for a particular floor is chosen from the pool of bosses for the chapters of the floor. However, some bosses and mini-bosses may not appear as degraded bosses at all. The same can go for mini-bosses, which can spawn on later floors as degraded mini-bosses. In later chapters, many of these non-final bosses can spawn as degraded bosses, or normal enemies.

The boss at the end of the floor must be defeated to advance to the next floor. Bosses are very strong monsters found in Boss Rooms at the end of a floor.
