You Find a Cursed Idol

If you somehow venture into the dungeon while a room's ability is on the stack, you will continue on in the dungeon. If you're already in the last room, complete that dungeon and start a new one.

Moving into a dungeon room will cause its room ability to trigger.

Choosing the dungeon or room to venture into is part of resolving the venture into the dungeon keyword action. Once that choice is made, players may not respond until after the appropriate room ability has triggered.

Dungeons are removed from the game as a state-based action.

You can only move forward (well, downward) in a dungeon, never backwards or sideways.

The player venturing into the dungeon chooses which dungeon they will venture into. They may choose a dungeon that they have already completed this game.