Basic Concepts

A spawner is an item with an owner

A uxmSpawners spawner is a normal block carrying NBT that names its type. Placing it registers it to the player who placed it; that ownership is what the menus, the friends list and the breaking rules all check.

Storage instead of drops

By default a spawner does not litter the ground. Mobs are killed by the auto-kill module, their drops go into the spawner's own virtual storage, and the player opens a menu to sell or withdraw them. XP is stored the same way.

modules/settings.yml decides whether new spawners start with virtual storage and XP storage on, and whether players may change it:

virtual-storage:
  default: true
  force-default: false
  permission: uxmspawners.settings.togglestorage

With force-default: true the choice is yours, not theirs.

Two modes: ENTITY and ITEM

A spawner type spawns either a mob or an item:

spawnerInfo:
  mode: ENTITY    # or ITEM
  material: ZOMBIE
  range: 16
  delay: 8

ENTITY uses the material as an entity type; ITEM uses it as an item and produces that item directly, which is how the shipped diamond spawner works.

Modern auto-kill

With use-modern-autokill.enabled: true on 1.16+, nothing is spawned at all. The plugin resolves what the mob would have dropped and adds it to storage. No entity is created, killed or ticked, which is the difference between a spawner farm the server notices and one it does not.

Levels and boosts

A spawner has a level, capped by modules/other.yml → spawner-level-limit.level-limit (256 by default). On top of that, boost items apply a temporary multiplier to either the amount spawned or the delay between spawns. Boosts are consumable items you hand out or sell.