"Do you have any other choice but to help us in the first place?" Spirit Queen Felona did not agree with Eren's unspoken demand. "If you don't help us, you will also die here. Isn't that correct?"
She only needed his help with breaking the Jar. After that, it was her fight. She didn't believe that he could defeat the Necromancer without their help. He couldn't leave this place without their help either.
He was stuck here with them. If they died, he was going to die as well. And if he died, they were going to die. Both of them needed each other to survive. It wasn't a situation where one had the upper hand.
The Necromancer had lived for a long time. He wasn't just a Necromancer but an Undead Necromancer, with magic strength beyond any ordinary necromancer.
Eren was surprised that even in this situation, Felona could think so calmly.