(don't hate me for this but i really wanted to create this so here it is)
One day in Level 1275, a backrooms roamer was flying around the eden garden on his dragon when he suddenly noticed a big red crack in the sky. He shrugged it off and flew away but suddenly turned around as the crack got bigger and bigger before a massive wave of energy was shot out and a massive red portal opened in the sky. A few seconds later piles upon piles of deadly entity's started pouring out of the portal and started attacking all nearby life forms, the dragons and their owners tried their best to hold them off but just like when it seemed they were winning strange red crystals descended from the portal and corrupted the dragons, turning them against their owners. Meanwhile a pair of young siblings (one male and one female) were latched onto by crown shaped crystals which took control over them, they declared themselves the rulers of the EX and rallied the EX entity's in a huge war that nearly ravaged the entire level. Ultimately the bad guys won but were eventually driven out by a blinding flash of blue light and the entity's were forced back into the portal which was sealed away while the siblings and the dragons were purified. Major backrooms groups who had outposts stationed in the level during the war named it....The EX corruption incident.