This thread is going to be a compilation of strategies and not wholly original work.
Toth and Zorn
So the fight mechanics for this fight are as follows:
Toth Abilities:
Smash – An AOE attack that hits everyone within 25m of Toth. If positioned correctly, only the Toth tank and the melee should take any damage.
Backhand Smash – A 2 second knockdown. Seems to hit anyone in front of Toth.
Cleave – Toth has a small Cleave that will hit anyone in front of him.
Ground Shatter – A sustained AOE that hits everyone within 50m. Also causes red circles to appear and then the ground erupts. Will kill you if you’re not topped off and just hurt you a lot if you’re not.
Berserk – Toth does 200% damage with all his abilites. Can only be removed by a successful Baradium Heave from Zorn.
Zorn Abilities:
Flurry – Zoth’s standard hit on the tank is a flurry of blows.
Emboldened – When Toth leaps to Zorn, anyone within 25m of Zorn will be affected with the Fearful debuff, which causes them to take double damage from Zorn’s abilities. Only the Zorn tank should be hit by this.
Shriek – An AOE that hits for small damage to everyone within 25m. Leaves two DoTS on anyone hit.
Mental Anguish – A damaging DoT applied by Shriek. Can be cleansed.
Weakened – A stacking debuff that causes the player to do less and less damage over time. Applied by Shriek. Can be cleansed.
Baradium Toss – Throws a piece of baradium ore at a random player within 25m.
Baradium Heave – Targets someone with a yellow circle. That player runs over to Toth and stands under him. The yellow circle turns purple when the debuff wears off, and then Zorn throws a huge baradium boulder at Toth that clears his Berserk buff. Anyone standing inside the circle takes huge damage.
Sonic Paralysis – Stuns the tank and does damage. Will not necessarily be breakable every time by the tank, so healers should be prepared for it the second time it happens.
Shared Abilities:
Surge – Both Toth and Zorn get a stacking buff that increases their damage done if they are too close to one another. They have to be kept separated to avoid this extra damage.
Enrage – When Toth dies, Zorn will enrage and vice versa. Therefore Toth and Zorn should die at around the same time. It’s better to kill Toth first to avoid the double damage Smash.
Strategy:
The raid splits in two 1 tank, 1 healer and 2 DPS on each side on 8-man. Any melee DPS should be on Toth full time and should never DPS Zorn. Ranged can be put on either boss.
Toth is positioned in the area just in front of the cave entrance. Zorn is positioned just in front of the tree to the left of the cave entrance, roughly 35-40m away from Zorn. Ranged on Zorn and Toth are 30m back in the open meadow, on their respective sides.

The fight consists of three phases:
Phase One:
Zorn will use Shriek on anyone within 25m. Toth will Smash anyone within 25m.
Tanks:
- Be conscious of your positioning and try to have your side to the raid, so that you no further from the raid than the boss. This keeps your healers from having to back out to avoid damaging attacks.
- Save your taunts for transitions. If someone rips right before a transition, don’t taunt and then have nothing when the leap happens.
Zorn Tank:
- Watch for the Mental Anguish and Weakened debuffs and make sure to call for a cleanse.
Zorn Ranged DPS:
- Be at max range to avoid getting hit by Shriek. Pay very close attention to where you are standing when the Toth leap is about to happen. Be at max range to avoid getting Fearful. If you do get the Fearful debuff, then go over to the Toth side until it expires and just DPS Toth.
Zorn Healers:
- Watch for debuffs that hit anyone on your side and make sure to cleanse them. If the tank positions poorly both you and the tank may get the debuff. You will have to swap sides if this happens.
Toth Tank:
- Move Toth quickly back to his original position to avoid a Smash hitting the Zorn side of the raid.
- Keep Toth faced away from melee and yell at them if they’re standing with you during this phase.
- Don’t waste your 2min stun break on Backhand Smash. You need to save it for Zorn.
Toth Melee DPS:
- Watch your positioning and don’t stand in front of the boss. You want to avoid the Cleaves.
Toth Ranged DPS and Healers:
- Be at max range to avoid getting hit by Toth’s Smash. This may be impossible for the healers to avoid if the tank positions poorly.
When one of the bosses falls below 90%, Toth leaps to Zorn. At this point the two tanks swap targets, dragging their new mob back to the original position.
When one of the bosses falls below 80% health, phase two begins.
Phase Two:
(We have been healing through this which would account for the spikes in healing need and the inconsistency in raid output, lets try it with more coordination and less crazy

)
Phase two begins with an emote “Toth is Berserk! Stay away!” At this point Toth now has a damage buff called Berserk that doubles his damage done. The healers on that side should be aware that Smashes and tank damage are going to double so more intense healing will be required on that side.
Meanwhile Zorn will begin tossing baradium at anyone within 25m of his position. He will remain stationary as long as someone is within 25m to soak rocks.
Everyone:
A yellow circle will appear under someone’s feet during this phase. That person must run over to Toth’s backside such that the yellow circle is underneath Toth’s feet. After 15 seconds, the yellow circle turns purple, and you have 2-3 seconds to get out of the circle. Zorn will then heave a giant baradium boulder at Toth and it will hit him, removing Toth’s Berserk and returning his damage to normal.
Toth Tank:
You will be taking double damage while Toth has the Berserk, so be prepared to use cooldowns during this phase if needed. Be very aware of your position relative to Zorn. If Zorn is out of position for some reason, make sure to be far enough away that people on your side are not getting hit by Zorn’s rocks.
Toth Melee DPS:
Smash will hit for double damage, and this is the most damage you will be taking during the entire fight. This is the time to use your damage reducing cooldowns and medpacks.
Toth Ranged DPS:
Try to position yourself so that you outrange Smash. Since it is hitting for double damage, you really don’t want to be caught by it.
Toth Healers:
The tanks and melee will take a lot of damage during this phase.
Zorn Tank:
Watch for Shriek right after the phase ends and make sure to call for a cleanse. Stay on top of Zorn to maintain threat and to be the target for his smaller rocks. Position yourself so that your healer can reach you without also taking rock damage.
Zorn Ranged DPS:
Be careful about cheating too far in. Don’t eat rocks when you don’t have to. If you get the yellow circle and have to run to Toth, make sure you return to your original position quickly. The transition to the next phase may happen while you are out of position, causing you to get Fearful. Be aware that this can happen and just stay on the Toth side if it does.
Zorn Healers:
If the Zorn tank has to leave because he gets the yellow circle, make sure to walk within range of Zorn and soak rocks to keep Zorn from moving. It’s better to help keep Zorn stationary than to avoid Fearful here. Still, you can try to be aware of when the phase is about to end and back away right before the leap to avoid it.
Try to help out on the Toth side with that damage if you can. It’s ok to cheat over there a bit.
Watch out for a Shriek at the end of the phase and make sure to cleanse the Zorn tank (and yourself if you get hit by it).
When one of the bosses falls below 70%, the fight returns to P1.
Phase One (repeated):
This phase lasts from 70%-60% with a leap occurring when one of the bosses falls below 60%. When one falls below 60%, Phase Three begins.
Phase Three:
Zorn will stun his tank with Sonic Paralysis. The tank should break the stun the first time it happens and keep DPSing.
Toth will begin pounding the ground. This ground shatter will do a raidwide AOE tick to everyone. In addition red circles will appear on the ground that will erupt with spikes after a few seconds. These hit for massive damage, so make sure to move out of them or risk dying.
At 50%, the fight will return to P1 for a third time.
Phase One (repeated):
This phase lasts from 50-40%, with a leap occurring when one of the bosses falls below 40%. At 40%, Phase Two happens again. In general, the fight alternates P1 with P2/P3.
Phase Two (repeated):
This phase goes from 40%-30%.
Phase One (repeated):
30-20%.
Phase Three (repeated):
The Zorn tank will get stunned during the repeat of Phase Three and won’t be able to break it. The tank should try to have a cooldown in effect before the stun happens and healers should be aware that the tank is stunned.
This phase ends at 10%.
Phase One (repeated):
Rinse and repeat.
Video for Fight
http://www.youtube.com/watch?feature=player_embedded&v=1oAYmRDqV2Y#t=0s