LogFAQs > #955379501

So dungeons are basically contraptions.

https://i.redd.it/eo7pl5tu08771.png

Basically you have access to all three of these at any point during any game. If a card tells you to venture into a dungeon, you advance one room through whichever one you want. Once you complete a dungeon you can start a new one (or do the same one again).

It's essentially free value, so if any of the cards that venture are good enough, these will be played quite a bit.

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http://card.psnprofiles.com/1/Gylgamesh501.png