Since his time on Earth, Finn has learned to keep a calm exterior while his mind races.
Nagic had just said he needed to take him and that was a bit unexpected. He had expected something Nagic to come with information of sorts, but he didn't know it'd be this soon.
He calmly replied to Nagic in his head, "Oh, what is this about?"
While Nagic was still dragging words with Anatalia, he gave Finn an answer through their telepathic connection.
"After extensive research, I believe it's related to the relic of god."
'Relic of god, I'm not sure if this is what I'm looking for, hmm, I guess a key can also be a relic... Also, I'm not really sure if I can fully trust this guy.'
Finn's reason for trusting Nagic at the moment by normal people was that through ordinary means one couldn't sense the aura of Echo of God. Even while using his True Perfect Sense, Finn couldn't sense the aura from himself.