Wraith is a name applied to two distinct creatures in the Doom series.

Doom 3

The Wraith is a humanoid demon with the ability to teleport and a focus on melee attacks with its bladed arms.

Doom 2016 & Eternal

The Wraiths were a powerful species of creatures native to the Cosmic Realm with abilities the local humans regarded as magical. They were imprisoned in the Well following the Argenta Civil War and tortured so their essence could be used in the production of Argent Energy.