Lil Blub

Lil Blub is a boss added in The Binding of Isaac: Repentance that can appear in  and.

Behavior
Lil Blub diagonally floats around the room and performs the following attacks: The previous two attacks also cause any Small Leeches that are swarming around Lil Blub to start chasing Isaac. Lil Blub cannot use any of these attacks if there are 6 or more Small Leeches in the room.
 * Spits up 2-3 Small Leeches that swarm around him, blocking shots.
 * Spits out a single larger Small Leech that chases Isaac instead.
 * Fires 6 streams of projectiles outwards in a radial burst.
 * Jumps once towards Isaac, creating a burst of disorganized arcing projectiles upon landing.
 * Lil Blub can only use this attack when below a certain threshold of HP.
 * Jumps towards Isaac 3-5 times, firing projectiles in the cardinal and diagonal directions upon landing. The cardinal shots are faster and travel further than the diagonal ones.
 * Any leeches Lil Blub lands on are instantly killed.
 * Lil Blub can only use this attack when below 25% HP, and greatly prefers using it if he can.

Upon death, he spawns 2-4 Small Leeches and bursts into a fountain of projectiles that rain down for a few seconds in a wide area.

Trivia

 * Lil Blub's original name in Antibirth was "Beelzeblub", and he is referenced as such in the game files.
 * In pre-release content for Repentance, his name was Lil Bub, without the "L". The reason for these changes to his name are unknown.
 * Lil Blub appears to be a drowned version of The Duke of Flies.
 * It is possible that Min-Min is his posthumous version- as Min-Min wears a shell that resembles The Husk, the posthumous version of the Duke of Flies.
 * When encountered in the, the color palette of Lil Blub and his attacks is altered to fit the floor. Wormwood also features this.