Artifacts
"Is this me?" Laz had seen signs that he was changing. His skin had turned a grey color for a while and he even got those strange tribal tattoos that started growing longer. But this? This was like all of that, only worse. Even his hair was longer and there were strains of white mixing within the black. He didn't have a mirror, but he felt like he looked monstrous.
"This is the you if you could fully utilize your abilities. You are not at this point yet. You also lack a good environment to be able to go all out. If you are able to burn energy at the same rate you restore it, your body would become like this, permanently."
This was a shocking revelation to Laz. He had seen others change, like Ruby and Leona, but once they stopped using their energy, they would revert back. And even then, although the changes were intense, they were simply changes and not a full body switch.
But that is exactly what this was.