N'kar the Betrayer appeared on the school grounds from a portal of fire, his horned head wreathed in flames. He stood a head and shoulders taller than the tallest man, his body broad and covered in skin that looked more like cracked stone, his hands massive and clawed. Not just a demon, but a hell lord, a wielder of powerful dark magic. Behind him were his priestesses, twelve of them, once human but now twisted by decades of dark magic and service to a hell dimension. They had no real loyalty to the Elder Gods, but N'kar craved destruction, and there would never be worse destruction than the Elder Gods set loose on the world. They needed to be a part of it.
The grounds of the school were already torn apart, turned-up earth slick with blood. Smoke and dust rose from parts of the building that had been reduced to rubble in an instant. The ground was littered with bodies -- most of them Cthon's human followers, which was of no concern to the Elder God himself, they had always been expendable. A means to an end to keep Earth's fighters busy, nothing more. Their numbers had dwindled to a pitiful few, and Yog-Sothoth's monsters were spawning slower and dying faster. But that didn't mean the tide was turning in the school's favor. The Elder Gods had never truly needed any help from lesser creatures.
At least no more of them had come through the opening in the barrier. There were more still waiting, gnashing teeth and snarling in the darkness on the other side, but their massive bodies crushed against the barrier and couldn't fit through. The crack wasn't big enough for them yet.