This is a vast circular underground catacomb battle arena, entirely constructed from glowing phosphorus minerals in blue-green and red-orange hues. There are no artificial light sources, with all illumination coming from the eerie self-generated glow of the minerals themselves. At the center of the space lies a circular pool filled with liquid white phosphorus, with cool flames dancing across its surface. Burning phosphorus embers drift through the air, creating dynamic, shifting lighting across the chamber. Ancient glowing green symbols are carved into the stone floor, and phosphorus-coated skeletons are scattered across the ground as obstacles. The overall atmosphere is hauntingly beautiful, filled with a mysterious, oppressive sense of the arcane.