It took 25 people to down this death knight, we all thought we were back at the beginning of Wrath of the Lich King; then it dawned on us. It is his expansion.

Video of phase three onwards can be seen Here

[Heaven's Fall, Kryss of a Thousand Lies] - Adeillis
[Mithrios, Bronzebeard's Legacy] - Term
[Sanctified Shadowblade Pauldrons] - Adeillis
[Sanctified Frost Witch's Hauberk] - Miranora