Mob Soul

The Mob Soul is a mob drop added by Draconic Evolution. It can be obtained as a very rare drop from killing mobs with Draconic Weapons or items enchanted with the Reaper Enchantment. By default any non-boss mob can drop a mob soul. There is configuration option to allow boss mobs to drop mob souls as well. Right clicking on a Stabilized Mob Spawner with a mob soul will change the spawner to that mob type. It can also be used to craft a Resurrection Stone.