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Difficulty Roll
A Difficulty Roll is an optional GM roll (d20 + modifiers) used to set Difficulty when needed.
A Difficulty Roll is an optional GM tool to set Difficulty when an NPC has no stat block (or when you want more unpredictability).
Roll 1d20 and add any relevant NPC/adversary Experience. The total becomes the Difficulty for the PC roll.
For attacks against adversaries, use the Difficulty in the stat block as normal. This roll is most useful for other uncertain action checks.