Several people in other threads have stated that the villains and henchmen are monsters because their cards say "Monster" under the "Type" section. They have stated that this means that when you play Ambush and it says, "Examine the location deck until you find a monster, encounter it, subtracting 1 from each die rolled in your check," you stop when you find a villain or henchman (as long as it says "Monster" under "Type"--there's at least one henchman that's a barrier, not a monster: Poison Trap, so I assume that wouldn't count).
Then by the same logic, what about these two cases?
1) Nettlemaze (location): "When Closing, Summon and defeat a random monster." Since villains and henchmen are now established to be monsters, shouldn't we be drawing from a pile that combines monsters, villains, and non-barrier henchmen to perform this close attempt?
2) Warrens (location): "At This Location, When you encounter a monster, put a random monster from the box on top of another random open location deck." Shouldn't we be adding a random card from a pile that combines monsters, villains, and non-barrier henchmen to perform this since they're all monsters?