The Soulwarped Seals of Anduin Wrynn - Priest and Death Knight Class Rings in Sepulcher of the First Ones

wowhead.com:

Continuing our showcase of unique items from Patch 9.2's upcoming Sepulcher of the First Ones raid, we have two class specific rings obtained from the eighth boss, Anduin Wrynn. Available only to Priests and Death Knights, these unique pieces of jewelry represent the duality of the tortured King of Stormwind, torn between his past as a Priest and his current domination as a Death Knight of the Jailer.

These themes are also well represented in his raid encounter, as Anduin uses several Priest-like abilities like Beacon of Hope and Wicked Star, alongside more traditional Death Knight attacks such as Soul Reaper and Remorseless Winter. The two class rings obtained from Anduin represent his past training as a Priest of the Holy Light and current existence as a Death Knight dominated by Jailer.

The Soulwarped Seal of Wrynn represents Anduin's past training as a Priest of Holy Light. A nice touch of the flavor text indicates that the ring may have actually belonged to Anduin's father, Varian Wrynn, as it features a quote from the Lion of Stormwind — stated during the Legion cinematic trailer, shortly before his death on the Broken Shore.

The special effect, Lion's Hope, may seem a bit strange for someone playing Shadow, but would seem to work rather well for all specializations — increasing damage and healing with a greater chance to proc as the target loses health. There is some question of whether it will be subject to proccing on unintended targets, however, which could be problematic if a Shadow Priest inadvertently triggers it on an ally, or Holy/Discipline Priest triggers it on an enemy, and therefore loses the buff to their primary role.