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.

Alphabirth Enemies

Name	Image	Pack	Attack Pattern
Apparition			Appears randomly, if killed before it disappears the player gets a Big Sack.
Brimstone Host			Behaviour like a Host, but shoots a Brimstone laser instead of shots.
Fleshy Planetoid			Orbits Isaac and blocks shots.
Meathead			Lines up with Isaac and slams his head shooting a shockwave at Isaac.
Stargazer			Remains idle until it opens its eyes and shoots Hush lasers at Isaac.
Stoney Planetoid			Orbits Isaac and blocks shots, cannot be killed. Die when the room is cleared of all other enemies.
Wizeeker			Appears periodically shooting flames in Isaac's direction.

Enemy Variants

Name	Image	Pack	Attack Pattern
3 Eyed Nightcrawler			Burrows up and down periodically, shooting 3 quick shots in succession at Isaac.
Bomb Dip			Randomly slides around the room, exploding upon death.
Demon Bony			Randomly walks around the room, shooting an explosive arcing bone projectile at Isaac when he gets near.
Devourer Globin			Chases enemies doing contact damage, killing one grants the Devourer Globin a stat boost and switches his target to Isaac.
Dip Ulcer			Burrows up and down periodically, shooting Dip enemies towards Isaac.
Injured Round Worm			Burrows up and down periodically, shooting out a puddle of creep.
Kamikaze Fly			Bounces around the room dropping bombs. Explodes upon death.
Leech Creep			Crawls along the wall, shooting out Dart Flies towards Isaac.
Lobotomy Gaper			Aimlessly wanders around the room, upon death spawns a Brain enemy.
Oozing Knight			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.
Zygote			Randomly hops around the room, splitting into two Zygotes every few seconds.