The Roll Hack

The Roll Hack is a roll modification mechanic for RPGs with roll under the attribute, in which positive or negative values modify the result rolled on the die, making it easier or more difficult to succeed in the intended action.

Compatible with: Cairn, Into the Odd, The Black Hack, The Black Sword Hack, and numerous OSR games with roll under mechanics (that use d20 or 3d6 for saves).