I mean, I knew he was aiming for that because that's the fastest way to go against constelations and we know Yoo did it on the main story so it's possible, but I thought this was endgame and that the requirements were even worse.
Don't get me wrong, accumulating fables is hard enough, but I thought there'd be 3 or 5 different criterias to be met, being acknowledged by a number of other constellations and not having a sponsor being 2 of them...