Are these opponents also immune to being Chilled and Frozen? Resistance can be altered somewhat by changing staves, but losing the CC effects could be crucial.
The following are immune to freeze:
Bear, Bronto, Druffalo, Giant, Great Bear, Gurn, High Dragon, Quillback, Bruiser, Despair Demon, Fear Demon, Pride Demon, Horror, Red Templar Knight, Shadow, Revenant
The following are immune to chill:
Despair Demon, Red Templar Knight, Arcane Horror, Corpse, and Revenant
To illustrate a point:
Consider a Great Bear, which has high resistance to cold and immune to freeze, but not chill. A winter-focused mage will be able to apply chill, which would grant them extra damage for a skill like Winter's Grasp with Winter's Ruin upgrade enabled. However, it should still only 1 damage because of the resistance.
*EDIT*
Also, none of my list includes DLC enemies. I am pulling data from http://dragonage3.wi...ife.com/Enemiesand it does not appear to be updated for ANY DLC.
I stripped the data out to a table and have a tiny CSH script to strip out information of interest. If someone can direct me to enemy resistance table that is more up-to-date I will include the new enemies in the list. Of critical importance (IMHO) are all the spirit resist enemies.