Keczan

I struggled mightily with this scenario... the guaranteed damage was painful. I just beat it for my first clear with Kera and Mersei. What I did was use armor / medallion to mitigate the damage. Additionally I used Augury, Scry, and ,spyglass to keep moving the villain to the back of the deck. After that I save my best weapon for discarding on the 40 roll and took my best shots. I additionally spread around blessing that added 2 dice between my characters so Each 1 could provide a double dice boost with their blessings.. it took about 2 days but I finally did it. Hope this helps. If you want more direct help you could post your builds and I will help further