Lumiel was corrupted by the Corruption of Margoz. He was slightly screaming at the pain that entered his body. It was tormenting on his side as his very soul was being turned. He gritted his teeth while it was slowly entering his soul. He can feel that his mind was hearing whispers of the said Demon Lord.
Slowly creeping out towards his consciousness and he can feel its power burst inside him. He can feel rising anger was clouding his mind. Animosity and wrath mixed were all directed towards all the enemies of his new master. Specifically making Lumiel duplicate and Isaias become his new enemies. He gritted his teeth to the pain and heard whispers inside his mind. Sanity struck him and he was whispered inside his mind to kill the two enemies of his master. They must be killed to lose all the pain he was feeling.