Doomed Dagger

A dagger of white banded flint, knapped to razor sharpness.

When you roll a 19 on the attack roll, you have a 50/50 chance to critically hit, roll another die to see if you do. When you score a critical attack add an X below, then roll d100, if the result is equal or below the number of X’s, tell the DM.

X = 16