Samur Maykr

The Seraphim is an entity mentioned in the lore of Doom (2016) and Doom Eternal about which little is currently known. One detail known for certain is that it was opposed to the forces of Hell: they are said to have gifted the Doom Slayer with super-human powers of speed and strength. In real-world mythology, seraphim are described as a high ranking and powerful caste of angels in the mythologies of, naturally opposing demons. Although the word is plural (the singular form is "seraph", in the context of Doom (2016) and Doom Eternal, the name applies to a single character.

Little information can be extracted from a few entries in the codex. Among these is a picture (an etching from the "Book of Daeva") that is speculated to contain an image of the Seraphim in the upper left corner. This mysterious figure appears again in the box art for Doom Eternal.

It is depicted as some kind of heavenly figure watching over a battle of the Doom Slayer and some Night Sentinels. It is unclear if this battle took place still in defense of Argent D'Nur or was part of the early stages of the Doom Slayer's campaign in Hell. It has been noted that the ramparts in the background of the scene bear an architectural similarity to structures found in Sentinel Prime.

Doom (2016)
The Seraphim does not directly appear, but is mentioned in the Codex to have granted the Doom Slayer his power.

Doom Eternal
In a flashback from the Doom Slayer's point of view, it is revealed that the Seraphim is the Maykr known as Samur Maykr, the former chancellor of the Khan Maykr who went rogue for unknown reasons. Having stolen the essence of the Father from Urdak in defiance of the Khan Maykr, Samur was impressed by the Doom Slayer and secretly gifted him increased strength, speed, and endurance using a Maykr device called the "Divinity Machine". He disappeared shortly afterwards, and was presumed exiled by the Argenta.

His ultimate fate is unknown, as are his motives for aiding the Slayer. Certain similarities between him and Samuel Hayden have prompted speculation the two characters might be somehow connected.