http://www.wowwiki.com/SartharionTwilight Drakes *
Tenebron o Has aura: Power of Tenebron: Shadow damage taken increased by 100%
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Appears approximately 15 seconds into the encounter, if left alive.
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Shadron o Has aura: Power of Shadron: Fire damage taken increased by 100%.
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Appears approximately 50 seconds into the encounter, if left alive.
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Vesperon o Has aura: Power of Vesperon: Maximum health decreased by 25%.
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Appears approximately 1 minute and 25 seconds into the encounter, if left alive.
Each drake can be taken down without engaging Sartharion. The achievements require leaving them up. If you do down them, they each drop a Emblem of Heroism/Emblem of Valor, but no other loot.
Vesperon and ShadronEach drake fight is a typical spank and tank, but after 15-20s the drake will open a portal. One healer, one off tank, and all dps need to take the portal, leaving only the main tank and his healer behind. Much like phased content, you'll be in the same place (totems still exist where you left them), but instead of seeing the drake, you'll fight a disciple of X, depending on which drake it is. They have a shadow aura that reduces damage taken by 25%, but periodically pulses shadow damage to you.
The drake will take significantly less damage and deal 50% more damage until the disciple is killed, so it is imperative to kill the disciple as quickly as possible. Once that disciple is downed, all players in the alternate realm immediately return to the real world. The drake will continue to summon portals and disciples that must be killed until the drake dies.
TenebronTenebron is similar to the first two drakes, except that in the alternate realm, instead of a disciple, you will encounter several eggs. The portal group will need to kill as many eggs as possible before reaching a time limit, at which point the eggs hatch, and everyone is reverted to the real world. Any unkilled eggs spawn whelps, which must be tanked and killed as quickly as possible, so that the DPS can return to the drake before the next portal appears. Each of the whelps can apply a stacking Fade Armor debuff, reducing armor by about 1200. Much better strategy for an undergeared group is to tank the adds WHOLE fight and let the DPS kill Tenebron. Whelps have a lot HP and trying to burn them down is an unnecessary burden.
The major drake of issue is Shadron since everything in the encounter is fire damage. Vesperon is less an issue as your raid is better geared.
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So there is no different portals. Whichever drake is still not killed, the eggs(Tenebron) and the disciples (Vesperon and Shadron) will be inside the alternate realm. That is why we saw only 1 disciple with the first portal (coz Vesperon was not engaged yet) but 2 disciples later when both drakes were engaged.
One question coz I cant hear properly over the vent. At some stage we just stop dps on the disciples. When is that and why?