C2374 Is it just this temperature

"What a cunning human boy, since that's the case, I'll let you use it!"

The Inferno Prison Elder unleashed his ultimate technique, activating the Purgatory Lock on the strongest white flame.

However, this was not the end. He took out another white porcelain bottle and shot out three drops of jade-like water.

When the three drops of water fell onto the Purgatory Lock