StackSpawners

Commands
/ss give 'nickname' 'mobtype' - Gives a certain type of spawner to the player.
/ss reload - Reload plugin.
How does it work?
This plugin changes the way the spawner works. Now, when the spawner is destroyed, it drops out with a certain mob inside. By pressing shift + right mouse button, you can stack spawners while it will spawn several mobs at the same time.
Mobs spawned by the spawner will also stack. And these mobs will have their AI disabled.
Required
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