A Reclaim the Wild Supplement
From the introduction:
The enemies presented in this book all have a default equipment loadout. Their Defense, Evasion, and the damage and accuracy of their attacks are all presented with that default equipment in mind.
However, that doesn’t mean that those foes must use that default equipment. Whenever a foe’s default equipment is not presented as Natural equipment, it’s ripe for changing out. It’s a quick and easy way to make one type of enemy feel a bit more varied, rather than a horde of faceless mooks.
This is particularly handy when the Heroes are fighting lots of similar monsters: for instance, if the Heroes are fighting through a bandit hideout, the various Brigands they fight might be using different equipment.
Perhaps some of them are caught unawares, without their armor. Some of them might have different weapons, or additional tools, changing their stats and tactics. And of course, perhaps some lucky or powerful foe is using an enchanted weapon, making them even more of a threat than their fellows.