Quote Originally Posted by ZeroZet View Post
So 10% it is.
That may not be the case, as the quote seems to only speak of a level 90 Spica and prince with the Big Hero buff without factoring in the other two possible buffs. A maxed out Spica has 557 attack before buffs. If you look only at the required numbers for big hero and Spica, that is only enough to one shot with a 30% buff. At a 25% buff vs flying you are one damage short, while the lower buffs vs flying need even more.

That said with my Nanaly having 542 attack, and making use Spica and Uzume awakening buffs, I can confirm that the buff is at least less than 25%.