• reversebananimals@lemmy.world
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    1 year ago

    Most roll under percentile systems like GURPs / Call of Cthulhu have the concept of difficulty.

    In those two systems, the GM can call the check “regular”, “hard”, or “extreme”.

    On a hard check, you must roll under 1/2 your skill. On an extreme check, you must roll under 1/5 your skill.