Ebonroc

Wing Buffet
Frontal AoE, reduces Aggro every 30 seconds

Shadow Flame
Frontal AoE for 4000-5000 dmg (ignors all armor and resistances). Causes a strong DoT without Onyxia Scale Cloak.

Shadow of Ebonroc
Non-dispellable short-duration curse on the current aggro holder that heals Ebonroc if he can do damage to him. Each hit on a cursed player heals him for 25k HP its not a wiper if the healing rotation is good, so its just a matter of getting in the groove with the taunting.

PLAN:

Group 1 setup is MT1 + MT2 + MT3 + Warlock + Paladin. Group 2 and 3 are heal teams A and B with 2x druid + 2-3x priest + 0-1x Paladin if possible. Healing only on Tanks, the fight is long, rotation is needed and DPS has to bandage.

Tank 2 and 3 get in position in the alcove as show above. A hunter pet pulls Ebonroc to them. Tank 2 gets aggro and both tanks build aggro for one minute (not caring about the curse).

After one minute aggro building, Tank 1 gets in position 90° off Tank 1 and 2 on the other side of Ebonroc. DPS starts when Tank 1 is in position.

When Ebonroc casts his curse on Tank 2 or 3, Tank 1 taunts Ebonroc immediately to avoid damage on the cursed tank. Just after that, the aggro-tank that doesnt have the curse taunts and tanks Ebonroc to let the curse wear off.

As a safeguard the offcenter positions can be augmented by an additional tank each.

Wing Buffet
(Works for all 3 Dragons the same)

We ignore the wing buffet in this fight, since its a taunt frenzy anyway.