We're running a series of one-shots with differing DMs every session, keeping the same characters and only swapping out the person who is DMing. The party is a little overpowered, and I wanted to do a little something that would remind them that death can happen (I warned everyone beforehand that death IS a possibility in my games).
I have a little mini-dungeon with a lot of puzzles and illusions, and it's relatively safe as long as they use their abilities and magical items. For the last chamber (before they fight the enemy that trapped them) I wanted to have a room with moving walls that will crush them unless someone sits on a throne that will drain their blood and kill them.
Now, I'm not entirely sure if the cleric has revivify, but next to this room they will notice a chamber where my character (who DOES have revivify) will be able to bring the other character back to life. (they're basically on a quest to find my character who disappeared after getting caught stealing some magic items from a hag).
Would this be weird? Revivify requires you to touch the character within a minute, but I figured it takes a while to bleed out and since the room is close by, it could reasonably be said that everything happened just in the nick of time.
They'll be level 7 and it's a party made up of a rogue, hexblade warlock, cleric, fighter, artificer and sorcerer (and my lore bard).
To clarify, I won't coerce them into doing anything, this is just the default solution and I'll allow any creative ways to get out of the trap.