A scenario from our game last night.
We are facing monsters with an Aura 2 that causes 5 cold damage and stacks (enter or start turn in aura). These guys also have an attack that immobilizes and does ongoing 5 cold damage.
Our rogue has the Crown of the Winter King on (resist 5 cold).
During the round one of the monsters attacks her and she is immobilized and has ongoing 5 cold. She is also in the aura of 2 of the monsters.
How much cold damage does she take at the start of her turn?
10 because she takes 15 and only has resist 5 OR 5 because she resists both the save ends damage and half of the aura damage?