Patch 5.1 brought a nerf to the Reliquary of Souls; a cooldown seems to have been added to Spirit Shock, meaning it isn't spammed, and seems to be about 10 second gap between each one; meaning even if you get hit, you have time to burst his shield down and interrupt the next one. Admittedly I still nearly died from the feedback damage but that was just me being careless.
I just tried soloing the rest of it and sure enough, did it all. Council gave me trouble on first attempt as I didn't focus on healing myself and let myself get too low, (as I'm a monk) also saved Touch of Karma for when I needed to heal as it stops you being damaged.
Illidan went down and just got the main hand glaive! The run before the last run, he dropped the off hand but I lost it!
(Apologies if this is the wrong forum for it but I figure this is quite the announcement for the legendary farmers out there and thought people ought to know about this change. I only just found out about it, and I just got a legendary because of it.)
Get Glaive farming!