Here is another installment of exTRAPaganza, our Thursday over-the-top trap series.
Time, while constant for the adventurers, is not for the rest of the dungeon. As such, enemies will come back after being killed (i.e. time for them is reset to before they were killed), traps will be reset, etc. After every meaningful encounter, the party must make a hard Wisdom save, or the encounter they just dealt with will be reset in 1d10+10 rounds.