There are a few different ones...
Gronntooth War Horn [715 ilvl stats] Critical Strike, Haste, and Mastery w/
Chance on melee attack to increase Strength by 1152 and all damage against Demons by 10% for 15 seconds. Scoring a killing blow with the buff active grants 8 more seconds of the buff up to original duration. [800 ilvl stats] Chance on melee attack to grant Demonbane, increasing Strength by 2544.
(can be looted by Retribution Paladins, Arms and Fury Warriors, and Frost and Unholy Death Knights)
Judgment of the Naaru [715 ilvl stats] Versatility w/
Use to smite your foe for 14020 damage and restore 5% mana, also healing a nearby ally for 100% of the damage dealt, also dealing 150% extra damage against Demons. [800 ilvl stats] Smite your foe for 30960 damage.
(can be looted by Holy Paladins, Restoration Druids, Holy and Disc Priests, Restoration Shamans, and Mistweaver monks)
Orb of Voidsight [715 ilvl stats] Intellect w/
Chance that when hit with a harmful spell to grant Voidsight, increasing Crit Strike, Haste, and Mastery by 675 and increasing damage against Demons by 10% for 20 seconds. [800 ilvl stats] Chance to grant Voidsight, increasing Critical Strike, Haste, and Mastery by 1491.
(can be looted by Arcane, Fire, and Frost Mages, Balance Druids, Elemental Shamans, Shadow Priests, and Affliction, Demonology, and Destruction Warlocks)
Infallible Tracking Charm [715 ilvl stats] Agility w/
Chance on melee/ranged attack to deal 10972 damage and increase damage against Demons by 10% [800 ilvl stats] Chance on melee or ranged attack to deal 24229 damage.
(can be looted by Feral Druids, Survival, Beast Mastery, and Marksmanship Hunters, Assassination, Combat, and Subtlety rogues, Enhancement Shamans, and Windwalker Monks)
Purified Shard of the Third Moon [715 ilvl stats] Versatility w/
Use to give a shield that absorbs 100000 damage for 20 seconds and is 100% more effective if target is a Demon. [800 ilvl stats] Gain a shield that absorbs 220828.
(can be looted by Protection Paladins, Protection Warriors, Guardian Druids, Blood Death Knights, and Brewmaster Monks)