War in Subterranean World: Explosion

Vandal glared at this unknown person. He silently prepared himself for battle since he didn't know the purpose of the other side.

"Oh? A Chief Captain. You could capture me if you're at your peak. Unfortunately, you don't have enough strength in your current condition." The unknown man said. His voice feels like several people were talking at the same time.

"You...! A Six Shackles?!" Vandal was shocked when he realized the power level of this unknown man. He readied himself as his remaining mana flowed through his body.

"Goodbye, I've taken the Spatial Gem." The unknown man raised his hand and pointed his finger at him. "People called me Grim. Don't bother me, instead look carefully at your surrounding. They are here."

With that, a magic circle formed on the unknown man's feet. The magic circle emitted a bright light and it swallowed him. In the next few seconds, the light disappeared along with the man who named himself Grim.

"What was that?!"