So it really is the god's fault. I can't imagine being this fucking stupid and irresponsible as a celestial being.
Barter change can't be used on a human without the consent of the other party. To think she deceived both you and Lila, and then even stole your "Saintess" position.
Ok, first of all, whoever created this skill is fucking brain-dead, and I'm assuming it was the Goddess, so it's even worse. There was no consent here. Consent would imply they agreed to the change of their status, WHICH THEY DIDN'T. CONSENT DOESN'T WORK LIKE THAT. If you ask someone if they want to hold your hand, and they answer yes, it doesn't mean they agreed to you shooting them in the face, they agreed to holding your hand. Moreover, she didn't expect Isabel to steal someone's position? She's the one who created the fucking skill! She's the one who gave her the ability to do so!
And when it comes to Immuno-Boost, Garland "didn't have enough time to check whether it had any side effects or not"? Really? He had at minimum hundreds of years to do so! Are we dealing with gods or toddlers? This whole thing is pretty much an
idiot plot at this point.