Abandoned Dorm

A year before the events of the anime, Atticus Rhodes, Yusuke Fujiwara and a few other Obelisk Blue students stayed in this dorm, but one day, they vanished inside and (except for Atticus and Yusuke) they were never seen again. After the disappearance of these students, many tried to find them, but to no avail and the other students were later prohibited from entering the dorm. During this time, Atticus was forcibly endowed with the spirit of Nightshroud by Yusuke and then became one of Kagemaru's Shadow Riders, but was freed from the influence by Jaden Yuki. Later, a man named Gerard dedicates himself to solving the mystery and by the end of the third season, Chancellor Sheppard also decides to solve the cold case and find the other missing students. The dorm would later be destroyed by Honest. Exactly why the dorm was abandoned isn't stated. It appears to have some sort of Shadow Magic inside it, since during Jaden's duel with Titan, a real Shadow Game (as opposed to the fake one Titan set up) started for no explained reason. Despite this, many unanswered questions remain about the dorm. It was never revealed what exactly happened inside the dorm, and the other students were never found.