Disaster Inducement, a new ability borne from Nameless's study of the mystical arts.
The precondition for activating this ability is the malice others hold toward the spellcaster, allowing the caster to transform that malice into a corresponding level of misfortune and reflect it back upon them. A defensive countermeasure of the mystical arts, as the saying goes, "Kindness begets kindness; evil begets evil," Nameless could directly turn the ill intentions of others into bad luck for them. Just like how those two Liches spoke ill of him, and now their skulls are stuck in the Spine Wheel.
This was a retaliation equal in measure to the malice created, as speaking ill and being reduced to broken bones are both trivial matters for the Liches.