Historical Rules · 19 November 2021
Rule 309.5a
Official source text from the 19 November 2021 Rules release
If a player ventures into the dungeon while they own a dungeon card in the command zone and their venture marker isn’t on that dungeon’s bottommost room, they move their venture marker from the room it is in to the next room, following the direction of an arrow pointing away from the room their venture marker is in. If there are multiple arrows pointing away from the room the player’s venture marker is in, they choose one of them to follow.