When a PC rolls against an adversary, the stat block provides a Difficulty for the roll. However, if an NPC doesn’t have a stat block—or if you like the unpredictability of rolling—you can have that NPC make a roll to determine what the Difficulty would be. Though this can add to the time it takes to resolve the scene, it can also be a useful tool in situations where you’re unsure what the Difficulty should be. To make a Difficulty Roll, roll a d20 and add any relevant Experience the NPC or adversary has to its total.

Tip: Attack rolls against adversaries use that stat block’s assigned Difficulty . For other PC action rolls, it’s often easiest to add the relevant Experience to the adversary’s current Difficulty to determine the new Difficulty.