[Snake]

Oy vey, it will hurt the ones who got it for the sole sake of Sayakana for resist purposes, but again, sure, it's necessary to have a drawback, else it wouldn't be called a 'cursed' weapon in the end.

Though nothing against something more unique than 'just making the wielder of this curse be spooky and weak to holy enchant'. Like -50% Darkness Resistance for a change. Maybe both? :^)