'Try not to get angry or hateful towards Demonmir. You will only empower him if you do that.'
Alephee's voice sounded in Eren's head. The latter narrowed his eyes at Demonir and told the homunculus to explain what she was saying.
'The demons can draw power from the emotions directed at them. I can now confirm that Demonmir can draw power from people's anger and wrath directed at him.
The demons never shy away from infiltrating foreign worlds because of this. No matter if the world is conducive to mana or not, they can always invoke emotions from the world's denizens and use them to strengthen themselves.
And on that note, you better tell Levine not to direct her hate toward him either. She is only helping him become more powerful.'