Unholy Swords
Found in Naxxramas.
Item Count Chance 
Wartorn Plate Scrap1 13.5% 
Wartorn Cloth Scrap1 13.5% 
Wartorn Leather Scrap1 5.41% 
Misplaced Servo Arm1 2.94% 
Essence of Undeath1 2.94% 
Ring of the Eternal Flame1 2.70% 
Wartorn Chain Scrap1 2.70% 
Word of Thawing1 2.70% 
Harbinger of Doom1 1.10% 
Fate of Ramaladni quest1 1.00% 
Tome of Arcane Brilliance1 0.37% Zone Spawns Coordinates Naxxramas 2 instance
Thrash
Cleave