Gaius' Chambers is a room up in the castle tower full of potions and books mainly about science. The room is cluttered with many peculiar objects like vials, stones, and a rabbit mask. He also owns a leech tank, which he had Merlin clean on one occasion (The Once and Future Queen). Gaius has treated many patients who have needed to stay overnight in one of Gaius's several cots or beds including Merlin, Lancelot, Gwaine, Morgana, and several others.