Shadow Ash

Activate Cast a Spell or successfully perform a ritual as the primary or secondary caster

This small pile of ash glows with strange blue embers that coat whatever they touch with a thin layer of frost laced with veins of necrotic ichor. Adding this catalyst to an animate dead spell or create undead ritual wreathes the resulting undead creature in a shroud of frost that pulses with void energy. During a combat encounter, the first opponent to deal damage to the undead creature with a melee Strike takes 3d6 cold damage and becomes Disintegrate spell) with a DC 11 Flat. If the undead creature rises again, a desperate, garbled screech resonates from within its corpse.