Plagueheart Gloves

Plagueheart Gloves are hand armor for warlocks. They are part of the Plagueheart Raiment armor set.

Source
The gloves are a quest reward from Plagueheart Gloves (quest), crafted by a vendor from the Desecrated Gloves, an item which drops from Maexxna who currently resides in Naxxramas.