A Valithria kill from a Resto Druid PoV. Just showing a nice kill where none of us dropped our stacks for the whole fight and we finished in 3:43. Probably could have ended even more quickly if we'd stayed out after the 3rd portal and Bloodlusted, instead of going back in. The 4th portal might have been a waste since she was at 94% when we came out.
The first portal went poorly for me, only 2 stacks and no late refresh, but I got to keep my stack anyway since I'd delayed going in. Everything else was good. In general, if there's one tip I'd give healers to make Valithria less frustrating, it's to delay a few seconds going into the first portal--this will give you more leeway for refreshing your stack in the later cycles.
Edit: The Twisted Nightmares debuff has since been increased to 40 seconds from 35. It's now much easier to keep your stack up between phases.
Common questions:
Raid frames are OpenRDX.
Music is Eric Johnson, Cliffs of Dover.