The black wall started giving off heat as Alex slowly used his dao to increase its temperature. He tried his best to limit the heat within the wall itself, but he couldn't stop it from spreading through all the walls of the cave, rather than just a small portion of it.
He tried his best to send the heat back into the wall, but since he was already focusing on melting the ore, he couldn't divert his intent to the other parts as well.
Thankfully, Scarlet was there to help him. All she did was stay where she was and lower the temperature of the wall around her so that the heat didn't reach any other side of the mountain.
As the wall heated up, it started glowing a warm orange glow. Then, as he continued adding on the heat, it glowed bright red and started slowly dripping down the wall.
