They could use dark magic while using corrupted wooden wands, so Athos planned to add them to the mass magic training that would begin once the construction of the fortress was complete.
The bone abominations' magic was also extremely powerful, their effects similar to large-scale spells cast by first-tier mages. Bone abominations used mana from their multiple cores whenever they drew darkness or circulated mana through their bodies.
The bone abominations had an incredible learning capacity that surprised Athos and all skeletons. The multiple minds of the abominations worked together and shared their learnings with each other in ways that reminded Athos of what he was capable of doing with his magic organ, but on a much grander scale.