Spawners
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Kiran — Mineable spawners, chunk/player limits, custom spawner levels, presets, upgrading, spawner shop
EliteArmor
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Splodgebox — Customisable Armor Set plugin with 10+ premade sets. Multi Armor, Omni Armor + More
MobSpawnerEgg
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TeamVK — You place a spawner with a MonsterEgg, you can also retrieve a spawner into a MonsterEgg!