My group is playing Abomination Vaults, and on the second level there is a room with an undead Minotaur Skeleton Warrior. The book specifically states that it never leaves the room it’s in.
My group quickly figures this out and would simply have everybody ready an attack, one PC would open the door, triggering everybody else’s reaction, and would then close it again.
After doing this about 10 times they finally took down the skeleton despite it having resistance to most of their attacks, with none of them taking any damage.
This is a somewhat inexperienced group that doesn’t usually do strategy things, so I was happy to see them plan and execute.
Anyway what’s the weirdest way your group beat a supposedly challenging enemy?
Be careful letting your players do that. Once is fun, but AV has lots of encounters that say the thing won’t leave its room. You don’t want them to cheese every encounter like a video game where they figured out a glitch. I’d say if you are trying to run any kind of enemy that is smart enough to have self-preservation instincts, just ignore that stuff and let the monster chase the players.