"Overdue But Unwelcome"
Mirari, Nathan, Lazarus, Jace, Mei and a friend of the third's enter a ruin unrelated to the Incan temple it was found underneath, and are unknowingly led to release an ancient evil no man was ever ready for.
The group's curiosity, headed by Jace (who gathered the party to explore early), to explore before the rest of the students/teachers.
The party came to be manipulated by an old and corrupted Xen'toma to spill blood upon The Lock and open it for all who dwell beyond the Gateway it barred. It was only shortly after they left that the denizens of Sheol had rushed across the entire span of The Gateway and exited through the now wide-open Lock, and soon after, all over the world from the unfathomable deeps.