Bottom line up front: Eva saved me twice. This is why we love her!
If I was better to dodge the attacks, then the fight would have ended about 12 seconds earlier. This is a very potent dark/light combination build. I've not seen Queen's Throat utilized very much. However, it has exceptional mind and willpower. These three gifts, Ice Barrage, Ichorous Ice, and Baba Yaga's Gaze, have massive stagger potential for the Executioner in particular. She gains "crush" resistance in the second phase. It must be used in first phase stagger only for maximum efficiency of the already low ichor count. A very, very crucial point in the battle is directly after the shower. Immediately after the damage reduction window closes, Baba Yaga's Gaze (stagger, not damage mainly) as well as Ichorous Ice give the best chance to stagger her out of the spinning attack. Since you are close to her, she may or may not do her slide. This is an instant death. This fight has a lot of RNG present with her staggers and wakeup attacks. However, for the pure casters out there, this is one of the fastest and most consistent ways of taking her down due to her stagger potential.
Okay revenants, let's get back out there! Be safe adventuring in Vein!