These are the most popular Shadow Priest trinket combos. The most popular combo is Signet of the Priory and Azhiccaran Parapodia with 6.4% usage.
BiS Best in Slot data provided by Wowhead's Shadow Priest Best in Slot Guide.
These are the most popular Shadow Priest trinkets. The two most popular trinkets individually are Azhiccaran Parapodia with 27.4% usage and Signet of the Priory with 24.3% usage.