Combat profile
Current configured cost: 5; the standard adult native pool also uses 5. The shipped preset assigns FAST, MIXED, RANDOM, RANDOMHELL, UNDEAD and ZOMBIES. Existing settings, baby/variant prices and special theme rules can differ.
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
Tier-3 variant: Speedy Zombie Brute has its own entity ID, spawn egg and configuration. See its article for combat differences, wave selection and drops.
It inherits the standard IM Zombie’s melee combat, obstacle mining, support behavior and Nexus assault. Movement is doubled, but its current Minecraft 26.3 / NeoForge digging multiplier is 1×. See shared mining rules for tools, Efficiency, effects and water/air penalties, and soul-fire protection and water conversion below.
Soul fire & water
Standing a normal IM Zombie in actual soul fire creates a Speedy Zombie, preserving its health percentage, equipment, baby state and Nexus assignment. While its block position is inside soul fire, a Speedy Zombie rejects fire damage and clears its fire timer. This is conditional protection, not permanent immunity to ordinary fire or lava elsewhere.
Speedy Zombies can still convert in water: after about 30 seconds with their eyes submerged, a 15-second countdown starts and continues after surfacing. The resulting IM Drowned retains tier/flavour, baby state, equipment and Nexus assignment, starts at full health and uses Drowned movement. It does not remain a doubled-speed Zombie.
Drops
Loot follows the vanilla Zombie table.
Rotten Flesh • vanilla ratesVanilla replacement
No vanilla mob maps specifically to the Speedy Zombie; it is selected by waves or its spawn egg.
Related variants: the Fat Zombie eats other IM mobs to grow stronger; the Jumping Zombie combines configurable high jumps with fast swimming and cannot convert to Drowned.