Strange Silver Blades

Seven identical, extremely thin, crescent-shaped blades as thin as paper, incredibly sharp. The hilts are adorned with a carved demon head with closed eyes. They are used as ritual tools for the ‘Seven Ghosts Soul Devouring Art’. They must be ‘fed’ with the caster’s blood (via the demon head’s mouth) to activate. Once activated, the demon heads open red eyes and mouths to devour targeted spiritual energy or curses (like the ghost face curse).