Barean Westwind

Barean Westwind of Kul Tiras was once a prominent member of the Scarlet Crusade. He was part of the Scarlet Fleet's disastrous expedition to Northrend, and was lost off the Frozen Coast. A large statue was erected in his honor in the Hall of Champions, located in the Scarlet Monastery in the Tirisfal Glades.

However, recent reports indicate that he is still alive and has joined the ranks of the Scarlet Onslaught. Only a few know that he actually did die and that his corpse is being used as a disguise for the dreadlord Mal'Ganis, who was also previously thought dead but in fact survived his encounter with a vengeful Arthas Menethil.

In Wrath of the Lich King
With the Scarlet Onslaught's arrival in Northrend, Admiral Westwind resides within the cathedral of New Hearthglen. He is seen alongside High General Abbendis.

Near the entrance to the city, one of the Onslaught Raven Priests remarks to an Onslaught Footman, "The Grand Admiral himself has come to see to our dedication. If I see you slacking on your post again, I will gut you myself." What his position of authority is within the ranks of the Scarlet Onslaught has yet to be seen.

In a later encounter in Icecrown, players face him once more and discover his true form: the Dreadlord Mal'Ganis.

Speculation
It seems that he is attempting to corrupt other members of the Scarlet Onslaught. This is probably most evident in the form of the Raven Priests, who were conceived when "the Holy Light whispered a new blessing to the Admiral in his sleep which he passed on to Landgren."

Encounter in Dragonblight

 * "Kill them, Abbendis! Do not fail me."
 * "You've served your purpose."
 * "I will see you weaklings in Icecrown; if you live that long."

Encounter in Icecrown Glacier
Aggroed:
 * How did you find me? Did Landgren tell?

Killing a player:
 * Haha, incompetence at its finest.
 * You gave in too soon.
 * How disappointing.
 * Unfortunate, the best was yet to come.

At 50% health:
 * You thought I would just let you kill me?

When revealing his true identity:
 * What? No matter, even without my sphere I will still crush you. Behold my true identity and despair!

Mal'Ganis: I spent too much time in that weak, little shell. Mal'Ganis: Kirel narak! I am Mal'Ganis. I AM ETERNAL!

For the rest of this encounter, go to the quotes of Mal'Ganis.