Monster Nest: Cemetery & “Big Mob” Infected Zombie (IZ)

Overview for Monster Nests and Big Mobs
https://feedback.minecraft.net/hc/en-us/community/posts/360048090591-Monster-Nest-Big-Mobs-

Structure
It will have ruined dirt paths, cracked stones, new Tombstones and “Carved Stone”. The center will have an aged Mausoleum.
Spawns only in plains, forests and Savanna Biomes.
Spawn
50 block radius from the center of the structure, Zombies are 65% more likely to spawn than other mobs. An Infected Zombie has a chance to spawn only when there’s a full moon, the chance of spawning increase by 10% every 12000 ticks after that
Trait
IZ will be larger than a normal zombie. It hits harder, moves quicker and immune to healing
Battle Cry & Hostility
Once hostile to a mob. IZ will make a large groan, turning all zombies in a 50 block radius hostile towards the entity
Zombies spawned in the structure will be hostile to all mobs
Fight
IZ has 2 attacking effects. Smite and a new effect called “Undead.” If the player or other mob is hit by IZ, they’ll receive the effect. “Undead” gives the mob all undead traits; Burn in sunlight, hurt by healing, weak to smite, etc. If the player hits another mob, it will also get the effect
When low HP, IZ will flee while summoning more zombies so it can regenerate health.
Drops
IZ will drop “Undead Essence” only if killed by the player. Brew it to get the Undead Friendly potion. It makes all Undead Mobs neutral to the player. Make a negative potion to get the Undead Potion, that gives the Undead Effect