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
For a dedicated covered-tunnel engineer, see the Mole, which carries both mining tools and never attacks living creatures.
It inherits the Zombie Builder’s bridges, towers, Nexus pathing and melee behavior. Its mining tool is always a Diamond Pickaxe when the tool option is selected.
Current Minecraft 26.3 / NeoForge mining uses the same 1× multiplier as other Engineers, not twice their mining rate. Its pickaxe and effects still determine how quickly it clears each block. Read block mining and construction clearance.
Drops
Uses the vanilla Zombie loot table and does not receive the Pigman Engineer’s pork or leather bonus.
Vanilla replacement
A wave/spawn-egg specialist; natural Zombie conversion creates the base IM Zombie.