Only one set of Wings can be equipped at a time, and these will be visible even on character selection screen.
As a master of the dead, the crypts are part of your realm, and the rotting bodies within them are your most faithful allies.
These wings seem to be based on the never-released Osseous Grasp.
- ↑ 2017, Unearth New Rewards With the Rise of the Necromancer Pack!. Battle.net, accessed on 2017-06-06