Lucius was quite stringed by Gellor's ability to sense things. While he said that it was danger that he felt, Lucius was quite sure he could sense more things than that. After all, Lucius had not targeted Gellor with malice and thus, there was no real danger.
Hence Lucius guessed that it was the Hell Aether itself that had caused this. He had seen how Aether reacted with the hell energy and the violent reaction between them. Nexus had broken out in a protest when the Hell energy was introduced.
Even now nexus would destroy his hell imprint once he used then, which showed the antagonism between the two types of energies. Thus, Lucius reckoned that it was the Aether in Gellor's body that had warned him of this.
'If it really is like this, then I might need to find a way to mask it…' Lucius thought to himself.
One chapter today, sleepy and tired