I started doing MEs with combat pets (to spice up the game). I noticed that my light blue Zhentrim Warlock (Invoker) would draw aggro with her green-fireball-thingies. This caught my attention because I have run ME with legendary combat pets (Feral Dog, Cat, Kenku Archer, Air Archon, etc.) and none have drawn aggro, at least not enough to draw my attention--pun intended.
So I upgraded Zhentrim to legendary and took her to Lomm. She melted the mobs.
This got me thinking: are all invokers Xuna-ish? Has anyone done any testing?