Eren didn't feel the need to answer him. Even if that man had a unique essence that could avoid any protection, it didn't mean his sword was useless.
It was a sword that was used to slice through Heaven by the person in the dream realm. Even though he couldn't call out the complete sword, it was still the essence of that same sword.
"Do you know who you are going against?" the man asked Eren, after receiving no response from him. "If you stop right now, I might forgive you. But if you don't, you will regret it for an eternity."
"Do I know who I am going against? Are you talking about the Celestial Lord?" Eren asked the man, appearing just as carefree as ever.
Thanks to the system's hint, he had already realized the situation. He didn't know who this Celestial Lord was, but one thing was clear. That person couldn't come here.
If he could come down to hurt him, then the system's reward would be something related to escaping, instead of just hostility.
Hostility meant that person couldn't personally descend. As long as the threat couldn't come down on his own, then he wasn't as threatening as he appeared.
Moreover, it wasn't as if he was planning on fighting anyone beside the person in front of him. He had already planned about the end of this elaborate play to get rid of all the hostility that he had gathered.
The key was in the hands of the Holy Emperor, who was his clone that was going to do everything he asked. As long as there was no interference, the chances of failure were much lower.
"You... How do you....?" The man couldn't hide the shock on his face. Just who was this person? How did he know about the Celestial Lord?
The Celestial Lord was an existence comparable to a god that was so powerful that he couldn't even descend here personally. Even to send him down, he had to pay a lot of price. So how did these people know about him?
"Even after knowing about him, you are doing this?" The man glared at Eren in disbelief. "In that case, you truly deserve to die!"
"What do you want? She has nothing to do with my actions!" The man clenched his teeth, even forgetting the pain of having three of his fingers chopped off by Eren.
"You are right. She has nothing to do with your actions. I have no enmity with her. But you are different. You hurt someone dear to me. If you want this girl to live, then you have to die."
The man went silent, hearing Eren's words. He could try to use force to save her, but the chances of her dying in that case were higher. If he wanted to save the girl, he had to die.
He had failed in his duties, which was his failure. If she died, then his death was also inevitable. In any case, he was going to die.
"How can I be certain that you will let her live after you kill me?" he asked.
Eren looked at the girl in his hand, whose face was still pale. Even though she wasn't struggling to breathe like Felona, but she was still suffering the aftermath of his previous attack.
"What is your name?" he asked the girl.
"Tiena," the girl answered.
Eren returned his focus back to the man and raised his other hand towards heaven. "I take an oath with heaven as my witness. If you die at my hands, I will not kill Tiena. I will also free her!"
A heavenly oath in this world was a big thing. It didn't matter which continent one was from, a heavenly oath couldn't be broken once taken. At least that was the case until one was strong enough to face heaven.
The man could see that Eren had clearly not reached that level. Even the Gods or the Celestial Lord couldn't break a heavenly oath.
In his distraction about the heavenly oath, the man didn't notice that Eren had missed a crucial detail on his oath. It was an intentional omission that the man failed to catch.