Just based on my own readings, ca would seem to be fairly clear.  Poison and hb would seem to be affected as well, and certainly shows up as damage dealt by the poisoner after the fight.  The only ambiguous one, to me, is reflect damage.  It states the attacker takes a portion of the damage 'they' inflict (the attacker, not the opponent, deals damage to themselves).  Interesting.

Reflect Damage is the one I actually care about, tbh. I use Venomage for solo IG, and the only time I ever die is on wave 2.

Surprised you don't use tyrant, 100% success. Unless venomage is significantly faster?

About 30 seconds faster for now, but I saw a video of someone being able to bring it down to 2min30s, which is my goal.

Finally got around to testing this. Answer is no, reflect damage is *not* reduced by Iron Will.