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The Fast Travel Room (also called the Portal Room) is a unique location found east of the Dragoncave, surrounded by dense & extremely dense rock.
Inside are 6 red portals, linked to various landmarks across the world. It is incredibly useful, allowing the player to reach many important places quickly, however it only becomes usable after killing the Syväolento. While the room is still accessible before doing that, all the portals will vanish as soon as it's loaded. However once properly unlocked, they will be permanently open for all future runs. These portals take you to the world you are in, accounting for parallel worlds, unlike other portals in the game.