Obelisk blue is the middle of the three dormitories at Duel Academy. The accommodations in Obelisk blue are better than Slifer red but not as good as Ra yellow. This dorm will always and always will be the only dorm that will have both male students and female students. This dorm is the only dorm that accepts female students. The Obelisk blue students are identified usually by blue long-tailed jackets with white trimmings unlike the Ra yellow and Slifer red students whose uniform jackets are shorter in length. For females, the typical Obelisk blue attire consists of a blue top and a blue miniskirt, and blue boots.