In the quest to find Yuna, UTS needs to get to Paronjo (Badloon Castle), a dark area in Uchujin Kyojuku (Alien Residential Area). To do so, they have to increase their Deyueru Pawa (Duel Power). In order to quickly do so, they enter the Goroseo (Gollosseum) to partake in high ranked duels.