The Lashers
Do you happen to run with a prot warrior, elem shaman and a few mages?
the lashers can be stunned, if you are grouping up to aoe them down you could get the shaman to pop eartbhind totem the moment you call out 'stop aoe' to root them in place and the raid moves away, the warrior stays nearby and the moment they get free uses shockwave to keep them still for 4s more after that the first mage in the rotation (respecs frost for the pet) uses his ranged pet freeze to keep them in placce. That should buy you about ~10-15 seconds of ranged aoe to finish them off.
Haven't tried it myself, but thats what i saw in the method/fusion 25man freya+3 movies. One way was to have a warrior aoe taunt them out of the raid, shockwave in place and a ranged freeze to follow.
There are a few tricks for detonators that work on both 10 and 25man. The best way is to cycle aoe roots on them (mages, primarily). Have your mages spec into the water elemental (I think) so that they can do a cycle of ranged frost novas. Basically, stack up on the boss, aoe them to 20%, stop aoe, wait a sec (so that damage is no longer ticking), frost nova and run out. When everyone is far enough away, start the aoe. When the nova breaks, the first mage uses his aoe frost nova. When it breaks again, the second mage does it. Ideally, you won't need a third. A warlock's aoe stun (shadowfury?) isn't bad, either.
Oh, and have a frost trap in the middle.
Done properly, you don't have to worry about anyone taking any damage from the explosions.
We went with the challenging roar at 20% -> move adds -> kill at range strategy. It causes them to all take the same path back toward the raid, so we had a mage respec for improved blizzard and frostbite. What we settled on doing was having a designated death knight throw a death and decay pit down right before the AE taunt, and we'd use that remote pit as ground zero for the kill zone. Once they all got there, two of the warlocks rotated shadowfury to keep them stationary while AE started up again and the druid got clear. While actually fighting the lashers, we had everyone gather up just to the west of Freya until the sunbeams came up, and when they came up everyone jumped across her to the east side. When ground tremor started casting, the warlocks would shadowfury the lashers to pause all non-tremor damage. Damage halts were called for tree spawns, unless the lashers were sufficiently low to pull out for AE.
Finally, an earth elemental will constantly taunt them to where ever it is, so keep that in mind.
The Big Tree
Our conservator strategy involves splitting the raid into a few groups, and using cardinal directions relative to the conservator. Freya is stacked on top of him, to keep trees in range of the mushrooms. We have a dedicated nature's fury healer, who always stays in the west with a diamond on him. Anyone with NF has to go west, find the diamond, and stand in range to get healed while also remaining far enough to not zap him. If that means standing out in BFE without a mushroom and just standing there, it's better than dying. It's still subject to problems if all we get are shrooms in the SE area, but it works most of the time. The hard part is burning him down before the next wave is already up, which we just accept is going to occasionally not happen in time.
We use roughly the strat Splug described for conservator phase, but we run with 4 total paladins for this fight (2 holy, ret, prot), and freely use DSac and Aura Mastery through the conservator phase. Aura mastery strips off the pacify effect, which helps deal with iffy mushroom positioning, or unfortunately placed roots/trees, and DSac through the ground tremor just helped us clean it up, since otherwise Nature's Fury had a bad habit of killing someone. There isn't really another phase that rewards using DSac or aura mastery anyway, the 3pack can be completely controlled with stuns through ground tremor, and the detonating lashers is the freebie phase.
BoP. Ground Tremor is a physical damage effect. BoP on the Natures Fury target is pro.
Also, as mentioned above, Aura Mastery Concentration Aura works against the pacify effect by the Conservator. Normally we have me, the third paladin in the raid with AM, use mine for the beginning of each Conservator phase to allow much greater flexibility for the raid to get in position and move everything around to adjust to the emerging mushroom positions. The conservator casts the pacify effect as the first thing he does when he spawns, and it's something like a 4 second cast. I just use AM right as his cast is completing.
We're burning BoP to cover for the referred damage on sacrifice, since divine shield doesn't come off cooldown fast enough to use every time. The rotation our paladins use is convoluted, but they can actually get every ground tremor if she cooperates at all. Usually she doesn't, so we skip the lasher zerg tremors to let forebearance cooldowns fade.
One lasher explosion is enough to be lethal for most classes in conjunction with a ground tremor. Pretty much, the whole fight in 3-elder is about preventing anything else from happening during ground tremor, since the damage spike from it is enough to make the normally mediocre splash damage push people over the edge. Since roots and nature's fury are clearly marked, they can be combatted with PWS - there's not much else you can do./quote]
