Combat profile
For Minecraft 26.3 / NeoForge, wave base values and supported behavior can be changed per registry entry: see health, damage and base armor and mob abilities. Tier, size and wave scaling still apply.
Behavior
The Tier-3 variant has a dedicated Brute model and fitted armor; its chestplate is deliberately invisible.
Tier-3 variant: Zombie Villager Brute has its own entity ID, spawn egg and configuration. See its article for combat differences, wave selection and drops.
It combines the Zombie Villager appearance with the base IM Zombie’s player and golem targeting, Nexus movement, Nexus attacks and permitted terrain modification.
Drops
Uses the vanilla Zombie Villager loot table.
Vanilla replacement
Vanilla Zombie Villagers may be replaced at 30% health while the Nexus is active; IM kills can also convert Villagers directly.