Elemental Attuned Blade

Elemental Attuned Blade is a main handed sword with stats and bonuses for Mages, Warlocks, and Paladins.

Source
This is obtained from Bor Wildmane is Silithus after completing Abyssal Signets (quest), by turning in 3 Abyssal Signets you will receive a Sack of Spoils containing provisions, Gold, and the occasional Blue Item. This sword is a rare Epic found in the Sack.