One of the most challenging Valkyries. Realm Shift really makes the challenge easier.

[ commentary ]
So the strategy I used was to immediately use blade runic attacks as soon as she spawn those draugrs, especially when she spawns them at the edge of the platform. This allows me to knock them off the platform killing all if not most instantly.

I dont fight them. I use Boy's arrows to attract them to him & distance myself from the draugrs. Kara will come to me, therefore utilizing realm shift allows me to exploit that to my advantage. Using the blades is great because by chance any hell walkers are near Kara during your attacks they will get hit too.

If none of this make sense feel free to address your thoughts in the comments.