Our bard got a magic item that let them cast Wall of Thorns before we would normal have access to a spell that high level. We used it on a boss pretty much immediately to trap it in one side of a room while we mopped up the rest of its adds that didn't get killed by the Wall. The boss we were fighting was a bug queen. What we didn't know was that, while we were fighting the first adds, it spent the whole time spawning more behind the wall, since it didn't have any other actions it could spend. That did not go well lol

It was our first TPK, most of us were new to the game, and we put a lot of focus on RP, so the DM gave us the choice if we actually wanted each of our characters to die, or if we'd prefer to be Deus ex Machina'd. I was the only one that chose to let their character die. My warlock had made his pact initially as part of a deal to save his sister who was crushed in a cave-in. He decided to swear more oaths, fully giving his soul for eternity to his patron, in exchange for saving the lives of his friends.

It was a pretty cool way for him to go out, and now he gets to be an antagonist later. That's going to be interesting, because our bard took up his fake religion out of a desperation to know that he went to a better place