Zombies, zombie villagers, and husks have been modified to have an extra attack, a new ability, and better loot. The new attack is the "devastating dash", where the zombie charges at full speed towards you, dealing more damage than a normal attack. All zombies have now gained the ability to leech your health. Each time one hits you, they will heal 4 health. Finally, the loot tables have been upgraded. All zombies now drop iron nuggets and a special item. The special items of the zombies, zombie villagers, and husks are feathers, emeralds, and sand, respectively.

Skeletons and strays have been modified to have 5 extra health, run faster, have a special ability, and better loot tables. There's now a chance that when you hit a skeleton, it will go into raging mode where it gains an axe and becomes much faster. Skeletons and strays both now drop bone meal and more of the normal items, but strays also drop snowballs.

Cave spiders and normal spiders have finally become the formidable foes they always wanted to be. They're faster, stronger, healthier, drop better loot, and have special abilities. Both types of spiders now have a default 22 health instead of 16. Normal spiders, not cave spiders, have a chance to entangle you in a web on hit, and both types will go invisible every so often. They both drop more items than usual and sometimes cobwebs.
( infinite cobweb farm! )

Endermen on the other hand, have no extra health, speed, or damage, but have extremely devastating attacks. When you get hit by one of these things, you will become severely debuffed, and they will become slightly buffed. Despite all of this newfound power, they're more paranoid than ever, and even just walking a step too close to one will trigger it. They also drop more pearls.

I felt bad for buffing creepers too much, so I only slightly buffed them. Well, I guess it might be a little more than slightly. Sometimes a special creeper called Creeps will spawn who will explode upon your approach, no waiting time. At least Creeps is denoted by smoke that surrounds him. All creepers drop extra gunpowder and sometimes tnt.

You thought phantoms were bad? Think again. You'll definitely want to sleep now. Phantoms now spawn in varying sizes. Small, medium, and large. The bigger the size, the more feathers and phantom membrane it drops, and also the more damage it does. Each time one hits you, you'll float for a couple of seconds, and when you hit one, there is a very small chance that it will spawn 3 allies to aid it in battle.