No Place to Run
They're drawing power from the bones of my dead brothers...
I have no love for the cult, but I'm baffled by their audacity. There will be no mercy shown for them... not that I ever would have anyway.
Ensure that they have no place to flee when the slaughter starts. Place a destructive ward at the end of the path leading out of the shrine... where the road starts to give way to snow. Defend it until it is fully charged.