The Blood Prince Council is the first encounter in the Crimson Hall wing in Icecrown Citadel. The council consists of the darkfallen princes Keleseth, Valanar and Taldaram. All of them have been fought and killed by players (Keleseth in Utgarde Keep, Valanar in Naxxanar in Borean Tundra, and Taldaram in Ahn'kahet) and brought back as undead by the Lich King.

Group
Prince Taldaram and Valanar will need each a tank. Keleseth will be tanked by a range tank this should be a warlock or a mage. At least three players must stand in distance so that the fire balls of Taldaram will not spawn in the melee group.

    * 2 Tanks
    * 3 Healers
    * 5 Damage Dealers

Abilities
Hitpoints: 14,590,000

Prince Keleseth
Melee: 25,000 - 100,000

Invocation of Blood
The Darkfallen Orb empowers Keleseth, granting him more formidable abilities.

Empowered Shadow Lance
Hurls a bolt of dark magic at an enemy, inflicting 85,313 to 89,687 unresistable Shadow damage. (40 yards range. 1.5 seconds cast)

Shadow Lance ()
Hurls a bolt of dark magic at an enemy, inflicting 17063 to 17937 Shadow damage. (40 yards range. 1.5 seconds cast)

Schattenresonanz (Shadow Resonance)
Summons a Dark Nucleus

Prinz Taldaram
Melee: 9,000 - 17,000

Invocation of Blood
The Darkfallen Orb empowers Taldaram, granting him more formidable abilities.

Conjure Flames
Conjures a ball of flames that flies through the air toward the target and explodes on impact. 10,000 damage minimum. (50 yards range. 3 seconds cast)

Glittering Sparks
Glittering sparks shoot from the caster's hands in a cone, burning enemies for 16,152 Fire damage over 8 seconds and reducing their movement speed by 20%. (90 yards range. Instant)

Conjure Empowered Flame
Conjures a ball of flames that flies through the air toward the target and explodes on impact, dealing fire damage to nearby enemies along the way. (50 yards range. 3 seconds cast)

Prinz Valanar
Melee: 9,000 - 17,000

Invocation of Blood
The Darkfallen Orb empowers Valanar, granting him more formidable abilities.

Kinetic Bomb
Summons a Kinetic Bomb that floats towards the floor and explodes for 12,000 physical damage to every player in the room, knocking them back 200 yards. (50 yards range. 3 seconds cast)

Shock Vortex
Creates a vortex of swirling force near an enemy target that inflicts damage and knocks back enemies near it. (Unlimited range. 1.5 seconds cast)

Shock Vortex
Creates force vortices on all nearby enemies within 30 yards, inflicting 7,000 Physical damage and knocking enemies near the target away. (Unlimited range. 4.5 seconds cast)

Dark Nucleus
Hitpoints: 100,000

Shadow Resonance
The nearest target resonates with shadow, suffering 1,000 damage and reducing Shadow damage taken from all sources by 35% for until canceled [sic]. (15 yards range. Channeled. Lasts for 6 seconds)

Ball of Flames

Flames
Explode violently, inflicting a minimum of 7500 Fire damage to nearby enemies. Larger balls of flame deal additional damage based on size.

Kinetic Bomb
Hitpoints: 1,000

Kinetic Bomb
Explodes on impact with the ground, inflicting 9000 to 11000 Physical damage and knocking enemies back in a wide area.

Strategy
This is a fairly simple one-phase encounter. The enrage timer is very generous and should not be of any consequence. You will need two regular tanks and either one ranged tank or a third regular tank.

Invocation of Blood will randomly buff one of the Blood Princes and only that prince will have a health bar to DPS. The other princes will have 1 HP and attacking them will have no effect. Invocation of blood switches between princes throughout the encounter and DPS must switch with it. Prince Valanar will be the first prince with Invocation of Blood.

Any ranged class (or alternatively a tank class with strong ranged, such as a Deathknight) that can quickly gain snap aggro on the randomly spawning Dark Nucleii will work well for tanking Prince Keleseth. Dark Nucleii will spawn in the room around Keleseth and the ranged class must get aggro on them and stand near them. They will give the ranged class a stacking debuff that reduces shadow damage taken, allowing the ranged class to survive Empowered Shadow Lance which is cast when Keleseth gains Invocation of Blood. Dark Nucleii should not be hit too hard and also destroy themselves over time, necessitating finding more to keep the shadow resistance buff up. Dark Nucleii will follow whoever hit them last, so other classes hitting them accidently is a good way to get your ranged tank killed. Note that the damage reduction from Dark Nucleii is multiplicative not additive and you will still take damage even with 6 or 7 Nucleii on you.

Prince Valanar will use Kinetic Bombs which can be targeted and attacked to lift them higher into the air and prevent them from exploding -- if/when a Kinetic Bomb reaches the floor it explodes for 12,000 (or 16,500) physical damage to every player in the room and knocks them back 200 yards. He puts shock vortexes on random raid members which knocks both them and any nearby (~12 yards) raid members back 50 yards. When he gains Invocation of Blood he casts Empowered Shock Vortex which creates a shock vortex on top of every player within 30 yards, melee will need to scatter and get away from eachother.

Prince Taldaram will do a frontal-cone fire-attack and conjure balls of flame which follow a random raid member and do less damage the longer they are kited, minimum 10,000 damage. With Invocation of Blood he will launch Empowered Balls of Flame which do a huge amount of damage on impact and lesser damage to nearby targets along the way, doing less impact damage depending on how many players were hit while the ball was in flight.

It is interesting to note that though their level is classified as "Boss", their armor level appears to be that of a "clothie". What this means is that they take considerable amounts of damage very quickly. Heroism, especially, should be saved for Keleseth since he'll be constantly casting Shadow Lance. Meaning he'll be unable to dodge any attack during the time he's empowered.

The Blood Prince Council will go berserk and instantly wipe the raid after 10 minutes of combat.