Su Yu and the others had destroyed everything they could in the school. They didn't know what the "Life Nest" was, but they had a feeling it was part of some sinister ritual. They wanted to completely obliterate it, but that was easier said than done.
Eventually, it was Qin Jiagui who suggested a solution - to enter the "Fire Elemental Space", look for Fire Elemental Energy Stones, and then use them to incinerate the Life Nest along with all the bodies in it.
Whether to destroy the Life Nest, or to grant the souls of these thousands of corpses some semblance of peace, cremation was undoubtedly the best option.
Heeding Qin Jiagui's plan, Su Yu and Ada teleported into the Fire Elemental Space. Mounted on Ada, they set off in search of the Fire Elemental Energy Stones.
These "Fire Elemental Energy Stones" could be found all over the first level of the Fire Elemental Space. With Ada's recognizance abilities, they quickly found some.