Shade of Eranikus

The Shade of Eranikus is a level 55 elite and does not require a special summoning ritual or quest. Be 100% sure that you have cleared all of the dragonkin mobs in the rest of the instance before you engage the Shade of Eranikus, or they will all run to aid him in combat (and likely wipe your group). The boss is challenging, especially compared to other final bosses in previous 5 man content.
Overview
Tank
Engage the boss where he stands, and face him away from the rest of the group to avoid anyone but yourself being hit by [Corrosive Acid Breath]. The boss will target the player with the highest threat for [Deep Slumber]. If available, allow for a pet to tank the boss until his first cast of [Deep Slumber], then trade in your primary tank. You can also use a second tank if your group has one. A druid in Bear Form, Warrior, or a Paladin using [Righteous Fury] can take the second threat position and hold the boss while your primary tank sleeps off their [Deep Slumber].
Damage Dealers
All DPS need to be aware of positioning in this encounter. Ranged DPS should stay at maximum range and avoid being in front of the boss to not be affected by [War Stomp] or [Corrosive Acid Breath]. Using [Grounding Totem] negates the effect of [Deep Slumber].
Healers
This fight can last quite a long time in comparison to other 5 man bosses, so conserve your mana. [Grounding Totem] can negate the effects of [Deep Slumber]. Keep the tank topped off at all times, as they will be affected by [War Stomp] throughout the fight and unable to block.