The Villains Of The Realm.

The realm became full of hungry black grotesque flesh fighting and killing everything within reach. This was the hell that the whole Tyrant realm had been plunged into.

Even the demon gods struggled to survive. They couldn't corrode or overwrite the black tentacles, so their resistance was useless. They were torn apart little by little, so they could only escape for their lives. 

The whole plane was emptied in less than an hour. By that time, every inhabitant of the realm and invader had been dealt with. There was no more food in the realm for the giant black ball of flesh to sustain itself, so it stretched its tentacles into the dungeon portals to reach the High Heaven realm. It was there that it met resistance again.