Thanks to the BG Realm Event I've got an overflow of 7* Sig Stones, but I'm really torn on what the best / most efficient use of them would be.
These are my currently awakened 7* Champs - they're all sig 20

I don't have enough to max sig any of them but I could get 1 to about 140-160 (depening on class stones) or maybe split them between 2 or 3?
I'm thinking that my defenders would benefit the most - namely Domino, Kindred, and Korg?
Thanks in advance - stupid FOMO disrupting my decision making