Four Progenitors

"Headmaster, if this continues we will not be able to hold on!" One of the teachers said while he was reinforcing the barrier.

It took seven teachers just to form this barrier but they're just barely holding on. This was bad news. They needed at least an hour or two to fully evacuate the students of their school. So, all they could do was hold the fort until everyone was in safe zone.

"Where is Song?" The headmaster asked. He was talking about Teacher Song.

"He is still under calculation process, so I bet he won't be out until he finishes his job." A teacher answered with sweat running down his face.

"Dammit." The headmaster couldn't help but curse under his breath. He needed Song for something right now, yet he was still unavailable even during this crisis, "Have those alumni that we sought for help answered the letter?"

He was talking about the three alumni who reached the of peak level of this world.