Bloodfiend Hexer's Ashes

Ashen remains in which spirits yet dwell. Use to summon the spirit of a bloodfiend hexer. Summoning consumes HP rather than FP. This spirit conducts bloodboon rituals with a sacred spear, casts bloodflame hexes, and takes a singular pleasure in letting the blood of foes. Long ago, a subjugated tribe discovered a twisted deity amongst the ravages of war, and they were transformed into bloodfiends. The mother of truth was their savior.

This is dropped by the Chief Bloodfiend Boss. Chief Bloodfiend can be found inside Rivermouth CaveGrace. You can get to Rivermouth CaveGrace by heading South from Temple Town RuinsGrace site of grace and jumping down the coffin steps, or by heading northwest from Ellac River CaveGrace.