I haven't seen this build linked, but I think it's pretty ideal:
24/11/36
Blood: VoTW, need the stamina. Rune Tap: very useful after big breaths to avoid melee gibbing, or before breaths if your healer didn't top you up properly.
Frost: Icy touch debuff, Lichborne for awesome BS uptime in Shad+Vesp phase.
Unholy: Up to Bone shield of course, grabbing unholy aura for faster moving from waves/voids (for most of the raid as well), and Master of Ghouls for a possible lifesaving Death Pact (see rune tap).
This is the CD rotation I use during Shad+Vesp:
1st breath: IBF + HP trinket (pop IBF late, if lucky, the 2nd breath comes while the 15s IBF is still up)
2nd breath: AMS (after AMS pop BS/LB to bring BS asap)
3rd breath: BS + Hand of Sacrifice
4th breath: BS + AMZ
5th breath: Pain Suppression
6th breath: AMS (should be back if you used AMS fast the first time and don't get too unlucky)
7th breath: IBF + luck (if you're lucky, the breath isn't top-end, or your BS is back, or your DPS killed Shadron)
Killed Sart+3D before the patch, not been back yet. I didn't time our DPS last time, so I'm not exactly sure if I need to eat 6,7 or 8 full breaths, will find out soon
