The three princes (Keleseth, Taldaran & Valanar) all "share" the same health bar, but only one of the princes can be damaged at one time. The one with the "Darkfallen Orb" is the one to currently focus on.

Taldaran (Fire) -
* Frontal cone AoE - Keep facing away from raid.
* Fire Sphere - Targets random player. the further it travels, the less damage it does when it connects. Kite as long as reasonable. (Empowered: Only loses power by hitting other raiders, they can "tap it" by running across it's path)

Valanar (Physical) -
* Kinetic Bomb - Cast into air, must DPS until it dies, does massive dmg when it hits ground.
* Shock Vortex - Cast where a random raider is standing. Avoid stuff on ground (duh). (Empowered: cast where ALL raiders are standing)

Keleseth (Shadow) - Ranged "tank"
* Dark Nuclei - Tank needs to aggro these to him/her. They do periodic AoE damage to the tank but resist shadow dmg taken by 30%.
* Shadow Bolts - Massive shadow dmg, need Dark Nuclei to help with dmg.

Geez who's the chick who does this video. Holy cow she sounds haaaawt. Sorry for the interruption.

For some strange reason after reading Frosty's post "I hope she's 18" kept floating thru my head!