Taking a Soul Oath

Despite everything, he doesn't respond right away, instead Icarus closes his eyes as he ponders to see which one looks better.

'In the first option, I have more freedom, but in return I may have to end up staying a few years in this forest

As for the second, it is several times faster, but I have to give up my freedom'

After putting it that way, he no longer hesitates

He opens his eyes and as he looks at Echidna with a serious face, he says

"Okay, I made up my mind!"

She happily claps her hands and says

"Alright, to make sure neither of us back down on the word. Let's take a Soul Oath!"

"We have to do a what?"

"A Soul Oath"

Echidna's hands start to glow with a purple light and as she starts scribbling a series of symbols that Icarus doesn't know, she speaks