Spawner Upgrades

Spawner Upgrades adds a simple vanilla-item upgrade system for mob spawners.

Right-click a spawner with different items to change its spawn delay, spawn count, spawn range, nearby-player requirement, and spawned mob behavior.

The mod includes limits for every upgrade, action-bar feedback, persistent spawner settings, and custom advancements for reaching upgrade milestones.

Upgrade items

Sugar — lowers minimum spawn delay,
Fermented Spider Eye — raises minimum spawn delay,
Clock — lowers maximum spawn delay,
Bone — raises maximum spawn delay,
Blaze Powder — increases spawn count,
Rotten Flesh — decreases spawn count,
Ender Pearl — increases spawn range,
Clay Ball — decreases spawn range,
Dragon’s Breath — removes the nearby-player requirement,
Echo Shard — restores the nearby-player requirement,
Magma Cream — removes free will from newly spawned mobs,
Slime Ball — restores normal behavior for future spawned mobs,