Both Sara and Mahira were huge winners of this rebalance wave making them more usable than ever before.
Sara got finally some way to do more damage with the passive permanent buff she gets from receiving hits. it seems like she gets 20% charge attack cap up which is respectable, especially combined with the counter ability and debuff immunity. Having shield on ougi is also nice considering magna earth is stamina based.
Mahira's ougi effect allows her buff to be available with way less ramp up time which was one of her main minus (together with the dispellable buff which got fixed as well).
