The Triumphant Kel'Thuzad's Regalia items are sold by Alliance Aspirant Forudir in Icecrown for gold and Trophy of the Crusade. The legs and hands items also drops from Koralon the Flame Watcher in Vault of Archavon on 25-man mode. Triumphant Kel'Thuzad's Regalia is the Tier 9 Raid Set. It contains 5 pieces. Has set bonuses at 2 and 4 pieces.
Kel'Thuzad's Gloves of Triumph
Kel'Thuzad's Hood of Triumph
Kel'Thuzad's Leggings of Triumph
Kel'Thuzad's Robe of Triumph
Kel'Thuzad's Shoulderpads of Triumph
Wearing more pieces of this set will convey bonuses to your character:
2 pieces: Increases your critical strike chance by 3%.
4 pieces: Increases the damage done by your Immolate, Corruption, and Unstable Affliction spells by 10%.
Also there's recolor Horde version called Gul'dan's Regalia of Triumph, it's functionally identical, but have different artwork and name.
Here you can buy Tier 9 Warlock Kel'Thuzad's Regalia of Triumph for EU or US Servers.
You'll get guide for getting Tier 9 Warlock Kel'Thuzad's Regalia of Triumph
• You'll be able to get Tier 9 Warlock Kel'Thuzad's Regalia of Triumph
• Tier 9 Warlock Kel'Thuzad's Regalia of Triumph set