Board Thread:The Last Sovereign Discussion/@comment-29984007-20170712165254/@comment-28783361-20170721225006

Basically, she increased the HP cost on Blade Dance from 10% HP to 33%, and reduced the amount of damage each hit does so you probably need more of a dedicated support unit when using her.

I think she also upped the variance on every single one of her attacks so you're more likely to see them do half damage rather than full damage.