Hot.
Wei Wuyin found that his surroundings were heating up, like a pre-heating prelude to his eventual frying. If an ordinary soul were here, they would feel abnormally discomforted by the slowly rising heat, but Wei Wuyin was here with his physical body. Light-emitting silvery embryonic fluid aside, Wei Wuyin's physical body was refined by Absolute Hot Fire Energies and Scorching Ash Magma Energies, two Apex-level heat-exuding elemental energies elevating his resistance to typical heat to be absolute.
For now.
"This is only the start," Wei Wuyin murmured as he realized that the mucus-like substance on his body wasn't evaporating despite the rising heat or experiencing any adverse reaction at the moment. This only further strengthened his belief that this strange fluid wasn't ordinary, capable of remaining unaffected and even coming to Hell with him.