Ofuda is a piece of paper with mystical writings. You treat them as a simple ranged weapon, which has the the light, thrown(20/80), and finesse properties. They deal 1d4-1 bludgeoning damage on a hit, and whenever you would make an unarmed strike, you may replace any number of these attacks with an ofuda attack, and if you spent at least 1 ki point this turn they instead deal radiant damage. They cost 6 cp, and their weight is negligible.