When you spend the night in the Apocalypse Megadungeon, roll 1d8
1. The last monster you left alive spreads the word of your incursion
2. Rumors spread in the dungeon about you, but they're false or wildly exaggerated
3. A new monster or group moves into an area you left behind
4. Something powerful and dangerous picks up your trail and starts following you
5. Some incidental but identifiable piece of your equipment shows up back in town, along with a very believable rumor of your untimely deaths.
6. There's an earthquake, flood, cave in, or other terrain-altering event.
7. Nothing happens of note at all.
8. Something you've seen, sought, or left behind appears in the wizard's store.