EDIT: I am told by our Shaman (Onty) that he did indeed get inspiration from Vixsin who made a huge blog post on Tsulong, Ascendance and Ancestal Guidance, so thanks to him ^_^ His blog can be found here: http://lifeingroup5.com/
World of Logs for the kill: http://worldoflogs.com/reports/rt-vd...?s=2914&e=3085
Before you flame us for "cheating": We killed this boss in less than one raid night the reset before without this tactic.
I wanted to wait until other guilds on the realm had killed it before making the video public... That happened rather soon after this kill though, so whether or not it was done using this strat or "legit" remains unknown for now (no logs uploaded). I know for a fact the video, while unlisted, was seen by people from at least one rival guild, but that really doesn't matter now.
So how is it done? Our new resto shaman turns out to be a smart fellow. He found out that pets, while not counting as targets for Ascendance healing, still take healing from it. I think that requires a bit better explanation:
Ascendance duplicates healing and splits it between targets within 20 yards of the shaman. If no one is in range of the shaman and he casts a heal, he will simply heal himself for the same amount. If one other player is in range, that healing is divided by 2, but heals both targets. Let's say our Shaman heals Tsulong for 6 million. Ascendance heals another 6 million, which is split evenly between the Shaman and Tsulong, so 3 million each. Now, since pets don't count as targets, but still take the healing, the pets will ALSO take 3 million healing each. Coupled with Ancestal Guidance and Guardian Spirit, you get idiotic healing on Tsulong.
Ancestral Guidance takes 40% of the Shaman's healing done on targets and heals 3 injured targets within 40 yards. As a hunter, I can summon up to 31 pets at the same time (12 per snake trap (readiness = 2 snake traps), 2 dire beasts also with Readiness, my main pet (+1) and Stampede (+4)). Additionally, I specced every pet Tenacity for 40% increased healing, and obviously used Spirit Bond for another 10% (stacking multiplicatively, yielding a total of 54% increased healing). In the kill above, I didn't use Dire Beasts, but I had double Snake Trap and Stampede up.
Anyway, using the example before, and for simplicity's sake, 30 pets without any increased healing taken on them:
Shaman heals Tsulong for 6 million. Tsulong, the Shaman and 30 pets take 3 million healing each. That's 96 million healing. 40% of that (38.4 million) will jump to 3 other targets; Tsulong and 2 raid members. But wait, Tsulong has Guardian Spirit from a holy priest (which also resulted in a higher initial healing, without it the 6 million heal would be less than 4 million), so the actual healing from one 6 million heal with 30 pets up is 38.4m * 1.6 = 61.44m.
The funny part is, our shaman actually messed up a bit and didn't get to heal for as much as he could have. I've personally seen a log from a russian guild whose Resto Shaman also did quite a lot of healing, but that's cause he healed several times in the region of ~15-16 million. That would basically have been ~180m in one heal, had they used this strategy with 30 pets