The equipment piece is Bloodbough Cowl, Ilvl 420. Ask Mr. Robot is recommending the use of the azerite power Death Throes for a Discipline Spec in order to optimize HPS. WoW will not allow enabling of this azerite power. I have chosen Blightborne Infusion as that azerite power and Sudden Revelation azerite power are the only two available for Disc.