Akashio

'''Hadō #68. Akashio' (赤潮, "Red Tide''") is a Kidō spell, somewhat infamous because of its disturbing properties.

Description
First, the user dips their fingers in their own blood, whether from pre-existing or self-inflicted wound. Once the incancation is complete, the blood is then sprinkled in a wide arc directed at the target. The spell causes those drops to erupt into a veritable tidal wave of boiling blood that submerges a considerable area. Every living entity immersed in the lake of blood has their body and organs nigh-instantly melted away. Then, the blood evaporates quickly, leaving nothing but perfectly clean bones in its wake.

Incantation
"Red sea, choke us with liquid iron. Crimson river, reduce our bodies to hollow husks. Tears of blood, wash away our sins. May nothing remain in your wake."