Stabilized Mob Spawner

The Stabilized Mob Spawner is a block added by Draconic Evolution. It can be obtained when right-clicking a vanilla spawner with a Draconic Core. The spawner will not spawn any mobs until the player places a Mob Soul in it. Once the spawner gets a mob soul, it will function like a normal vanilla spawner but it can be upgraded.

Upgrades

 * Right-clicking the spawner with a Nether Star gives the spawner the ability to function without needing a player nearby.
 * Right-clicking the spawner with an Enchanted Golden Apple gives the spawner the ability to spawn mobs ignoring the light level and the block that mobs are spawning on (like slabs).
 * Right-clicking the spawner with a Wyvern Core upgrades the spawner to spawn more mobs more frequently, making it a tier 2 spawner.
 * Right-clicking the spawner with an Awakened Core upgrades the spawner to spawn even more mobs more frequently, making it a tier 3 spawner.

Note: When breaking a stabilized spawner, it will drop the spawner along with the upgrades that has been put into it. However, it will not drop the Mob Soul so it is advised not to break the spawner after putting in a soul.