Kel'Thuzad
Found in Naxxramas.
Item Count Chance 
Staff Head of Atiesh quest1 100% 
The Phylactery of Kel'Thuzad1 100% 
Ring of the Dreadnaught1 11.1% Bonescythe Ring1 11.1% Ring of Faith1 11.1% Frostfire Ring1 11.1% Plagueheart Ring1 11.1% Ring of The Dreamwalker1 11.1% Ring of the Earthshatterer1 11.1% Ring of Redemption1 11.1% Ring of the Cryptstalker1 11.1% 
Might of Menethil1 9.09% 
Soulseeker1 9.09% 
Kingsfall1 9.09% 
Nerubian Slavemaker1 9.09% 
Shield of Condemnation1 9.09% 
Doomfinger1 9.09% 
Stormrage's Talisman of Seething1 9.09% 
Gressil, Dawn of Ruin1 9.09% 
Hammer of the Twisting Nether1 9.09% 
Gem of Trapped Innocents1 9.09% 
The Hungering Cold1 9.09% Zone Spawns Coordinates Naxxramas 1 instance