i've killed the chief at least a dozen times, both regular and fabled, and had never seen the avengers... this morning i accidently aggroed him while camping the minstrel for my baby bard so i ate him for breakfast. about 2 minutes later, i get jumped by a couple greenies. Im a 65 war w/ 10k hp, 2066ac, full defensive aa's with 3% shielding and 13% avoidance.. i ate thru the first 2 easy enough and thought i only had 2 more... after popping disc after disc and killing THOSE two... i realized i still had 2 to go... needless to say i zoned into CC to avoid being killed (i was at about 13% health) since they run at SoW speed (i also found out the hard way.)
what an introduction.