Zombie - The classic minecraft zombie but faster, smarter and it doesn't burn in the sun
Zombie Brute - very lange and very strong tank like zombie
Blister Zombie - a faster, stronger zombie
Crawler - small, fast, has the ability to climb
Spitter - shots with slime balls

Disemboweler - Large, monstrous zombie with entrails hanging out, seeking blood and vengeance. Lumbers around looking for players and cows to consume, with attacks packing a heavy punch. Drops "corrupted heart" items on death.

Tormented Zombie - A hideous monstrosity disguising itself as a regular player (eight player skin variants). When stationary, it resembles the normal skin, but as soon as it moves, the true nightmarish form comes out. Sometimes found hanging from ceilings ready to drop on your head, or crawling through tight spaces to get to you. A very strong and vicious opponent, dropping golden apples on death.

Blood Eagle - A huge demon/dragon-like zombie with appendages made entirely from stretched out flesh, and sporting a set of razor-sharp teeth. Capable of both flying and walking, sometimes attacking from the air with spit projectiles or from the ground with melee - Eats pigs. Very strong, plus tameable and rideable (tamed with 10 corrupted hearts, configurable to disable taming).

Brutaliser - MINIBOSS. A huge, strong zombie that can smash the ground to create block shockwaves dealing devastating damage and knockback on impact. You can jump over shockwaves or evade them - whenever you move close to attack, be sure to evade quickly before it gets the chance to strike! Attacks sheep and drops a "Deathly Onyx" on death, used for crafting a special staff item that lets you repulse nearby undead mobs (right click hold) and even summon crawling minions (ground left click ability, charges up to 5 stored summons by killing undead while it is in your inventory).

Skin Crawler - Capable of camouflaging itself by changing colour to match the blocks around it, and breaking through stone, deepslate, tuff, granite, diorite, andesite, and netherrack to get to you (this can be disabled in config). Moreover, it can climb walls and crawl through tight spaces, making it hard to avoid fully. Also attacks chickens.

Spine Wrencher -
A tall, thin entity with tendril-like arms and a related appearance to the blood eagle, perhaps coming from a similar origin. This entity has to be close to spot you, unless you look directly at it. If you do so, then it will notice and come running towards your location. Given how thin it is, it has become fragile, so if you block its attacks with a shield, it will take damage whenever it tries to attack, providing a strong way of countering it. It is more than two blocks tall, but can crouch down to get through smaller gaps. Drops “Distorted Vertebrae” on death, used for crafting a powerful whip item.

And more !