These Skeletons can be found in the sixth room of the Lumbridge Catacombs Dungeon which can only be entered after completing The Blood Pact quest. They are different from normal skeletons as they have a blue glow in their chest and mouth as opposed to a green one. They were created by Dragith Nurn, a now undead necromancer, during his experiments with stolen corpses. This is one of the monsters that drop Mask part 2, which can be used with the 4 other parts to create the Mask of Dragith Nurn.