Just killed an Obsidian Golem, was using my Sov, who has Stun, and a Champion with double strike. Each time I used the special ability attacks, the golem was immune and took no damage. Normal attacks did damage as normal. I understand being immune to stun, or at least the stun effect of that ability, but double strike? That's not applying any special effects, debuffs, or conditions to the golem, it's simply supposed to be two attacks. Full immunity to both seems overboard.

I recall from the patch notes that there were changes to make sure that Immune To Magic also affected abilities that reproduced spell effects, but it seems these changes were possibly over-zealous.