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
It follows the engineer's Nexus pathing and melee behavior, mines obstructions without self-damage, and constructs bridges and towers from bricks. It spawns holding a ladder, mining tool or Engineer Hammer.
For descending spiral staircases, shared tower reuse and repair, see advanced terrain construction. These behaviors depend on the entity's configured abilities and server building rules.
For current Minecraft 26.3 / NeoForge block mining and construction clearance, this Builder uses a 1× digging multiplier. The held tool, Efficiency, Haste, Mining Fatigue and water/air conditions determine the actual rate; construction headroom is cleared through the same timed process.
Drops
Uses the vanilla Zombie loot table. Unlike the Pigman Engineer, this variant does not add pork or leather bonus loot.
Vanilla replacement
This specialist is selected by waves and its spawn egg; ordinary vanilla Zombie replacement produces the base IM Zombie rather than guaranteeing a Builder.