Monsters and Hazards
Improvised proficiency benchmarks for when a monster needs to detect or disable a hazard, since stat blocks normally skip that detail.
Parent page Attacking a Hazard
The statistics for NPCs and monsters usually don't list their proficiency ranks. Most of the time, they don't need to deal with detecting or disabling hazards the way PCs do, so you don't need this information. However, if a PC resets a trap in a monster's path or plans to lure a monster into a hazard, you can improvise this information.
For Perception, a monster is usually an expert at 3rd or 4th level, a master at 8th or 9th level, and legendary at 16th or 17th level. If the monster has Thievery listed in its skills, it has the highest proficiency possible for its level (trained at 1st, expert at 3rd, master at 7th, and legendary at 15th); otherwise, it's untrained. Of course, an individual monster might deviate from these guidelines, especially if it's mindless or not very perceptive.
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