Spawners

Spawners have a custom upgrade system. Players with smpcore.spawner.use can preserve, stack, and modify spawners. Staff with smpcore.spawner.admin can inspect and reset them.

Open the in-game modifier guide by right-clicking a spawner with an empty hand or with an item that is not a modifier.

Player Actions

• Spawn Egg: changes the spawner mob type and consumes the egg.
• Sugar: increases spawn speed. Default max is 32 sugar for up to 16x speed.
• Redstone Dust: toggles redstone control mode. By default, powered redstone disables the spawner.
• Eye of Ender: enables AI nerf if the server config allows it. Spawned mobs stop targeting and pathfinding, but still keep normal physics interactions.
• Nether Quartz: resets sugar, redstone control, and AI nerf. Stack size is kept.
• Spawner item: stacks same-type spawners together. Default max stack is x64.

Breaking And Placing

• A Silk Touch tool preserves the spawner only when spawner Silk Touch is enabled and the player has smpcore.spawner.use.
• Preserved spawner items keep mob type, stack size, sugar count, redstone mode, and AI nerf state.
• Breaking without valid Silk Touch drops XP instead of the spawner. XP is 15 + 5 per extra stacked spawner.
• Creative mode does not create survival spawner drops.
• Placing a custom spawner item restores its saved data.
• Explosions clean up tracked spawner data so stale holograms/state do not linger.

Admin Commands

• /spawner info - look at a spawner within 8 blocks and show type, stack, sugar, speed, redstone, and AI nerf data.
• /spawner reset - look at a spawner within 8 blocks and reset it to default modifiers.
• /spawnermgr - alias for /spawner.

Creative Pick Block

Creative pick-block on a custom spawner is restricted to smpcore.spawner.admin.

When allowed, it gives a custom spawner item that preserves the tracked data instead of a plain vanilla spawner.

Current Defaults

• Silk Touch spawners: enabled.
• Max stack: 64.
• Sugar max: 32.
• Max speed multiplier: 16x.
• AI nerf: enabled.
• Redstone control: powered redstone disables the spawner.
• Minimum spawn delay floor: 40 ticks.
• Stacked spawn count cap: 32.
• Nearby entity cap: 96.

Performance

• Stacked spawners scale by the square root of stack size instead of multiplying every spawn directly.
• Spawn count and nearby-entity limits stay capped by the values under spawner.performance in config.yml.
• Chunk loads preserve an active spawner countdown and skip tile-state writes when the saved settings already match.
• Redstone clocks coalesce repeated hologram refreshes into one update per spawner per tick.
• AI-nerfed mobs avoid pathfinding and targeting work while keeping normal farm physics.

Common Problems

• If a spawn egg does nothing, the player may not have smpcore.spawner.use.
• If stacking fails, the spawner types must match and the result cannot exceed x64 by default.
• If mobs stand still after spawning, AI nerf is enabled on that spawner.
• If a redstone-controlled spawner stops spawning, check whether it is powered.
• If a spawner drops XP instead of itself, check Silk Touch, permission, game mode, and config.