Alphabirth adds 3 types of new monsters to The Binding of Isaac: Rebirth. Alphabirth Enemies add completely new enemies to the base game, with unique AI behavior and mechanics. Enemy Variants add new types of variants that can replace existing enemies in the base game, these enemies usually act very similarly to base game enemies with slight modifications. Champions add new champion types to the base game.
Appears randomly, if killed before it disappears the player gets a Big Sack.
Behaviour like a Host, but shoots a Brimstone laser instead of shots.
Orbits Isaac and blocks shots.
Lines up with Isaac and slams his head shooting a shockwave at Isaac.
Remains idle until it opens its eyes and shoots Hush lasers at Isaac.
Orbits Isaac and blocks shots, cannot be killed. Die when the room is cleared of all other enemies.
Appears periodically shooting flames in Isaac's direction.
3 Eyed Nightcrawler
Burrows up and down periodically, shooting 3 quick shots in succession at Isaac.
Randomly slides around the room, exploding upon death.
Randomly walks around the room, shooting an explosive arcing bone projectile at Isaac when he gets near.
Chases enemies doing contact damage, killing one grants the Devourer Globin a stat boost and switches his target to Isaac.
Burrows up and down periodically, shooting Dip enemies towards Isaac.
Injured Round Worm
Burrows up and down periodically, shooting out a puddle of creep.
Bounces around the room dropping bombs. Explodes upon death.
Crawls along the wall, shooting out Dart Flies towards Isaac.
Aimlessly wanders around the room, upon death spawns a Brain enemy.
Walks around leaving slowing creep behind. Charges Isaac when he sees him.
Round Worm Trio
Burrows up and down periodically, shooting a triple shot at Isaac.
Randomly hops around the room, splitting into two Zygotes every few seconds.