Foederati went back to Tempest Keep this evening for an 'emergency' raid. And we one-shot Kael'Thas! Weeeeeeee! The fight went from 'OMG this is impossible' to "OMG, we did it!" in just one week (day, really....) OMGOMGOMG
My heart was thumping so hard during the last 15% or so that my ribcage was shaking.
Did I mention "WEEEEEEEEE!"?