Marauder

The marauder is a new monster which occurs in Doom Eternal. It is a humanoid demon with a skull-like head bearing large, prominent horns. It has blueish-gray skin and wears green armor which closely resembles the Praetor suit. It keeps a garland of skulls around its left thigh, indicating that it may act as a headhunter. It wields a super shotgun and an Argent double-bladed battle axe.

Pre-release
Hugo Martin promised at the 2018 convention that there is a story reason behind the appearance of the marauder and its resemblence to the Doom Slayer which will be revealed in the game.

E3 2018
The marauder appears at the end of the story trailer of Doom Eternal, as the Doom Slayer pulls out a chainsaw in response while it is swinging its battle axe.