Jade-Skull Breastplate

Source
This item drops from Nethermancer Sepethrea in the Mechanar wing of the Tempest Keep.

Graphic matches
Thatia's Self-Correcting Gauntlets and Greaves of the Shatterer combine graphically with Jade-Skull Breastplate in a single suit of armor. They drop from Dalliah the Doomsayer in the Arcatraz wing of Tempest Keep and Warchief Kargath Bladefist in the Shattered Halls of Hellfire Citadel respectively.