The Mark of Unmaking

Oghma never stops learning. You've given him just enough power to comprehend the incomprehensible Queen of Voids Lethe. Void is a thing, apparently, and all things have uses, such is the Law. You may apply a Void mark that imbues the knowledge of unmaking a thing. When you successfully hit with a spell attack or apply a spell effect you may spend a Hit Die and choose a damage type. Until the end of your next turn that target has Vulnerability to the first instance of that damage type. You are marke