- "I offer you a gift. Take it. It will give you strength...help you on your journey. And now they will fear you."
- ― Samur Maykr, leading the Doom Slayer to grant him power [src]
Samur Maykr was originally a Seraph who dutifully served The Father and was responsible for administrating worlds, studied divine experiments, and reported progress in all creation. He helped The Father in defeating Hell's lord Davoth and reducing his essence into a Life Sphere. However, Samur failed in convincing The Father to destroy Davoth's essence and ending Hell, as The Father could not go through in eliminating his first creation and preferred containing Hell. Thereafter, The Father withdraw from the physical realm and Samur was tasked to store The Father's Life Sphere in the Luminarium of Urdak. Samur was also instructed to bring The Father's Life Sphere to a place that none could find it should The Father perceive any rising dangers from Jekkad, even though this action will brand Samur as a heretic by the Maykrs.
According to the Ligria Sultagenta, Samur later served as the chancellor to the Khan Maykr. Prior to the appearance of the Doom Slayer, Samur stole the essence of The Father and hide it away within Ingmore's Sanctum. This consequently damaged the Maykrs' Transfiguration process of voluntary death and resurrection, and prompted the Khan Maykr to siphon Argent Energy from Hell in order to sustain her race.
During Argent D'Nur's war against Hell, Samur played a role in helping the Doom Slayer and his allies in stopping a major demonic assault led by a monstrous Titan known as the Dreadnought. After witnessing the Doom Slayer's prowess in battle, and acting on his own accord, Samur hurried the Slayer to the Chapel of Purity and submitted him to the Divinity Machine; granting the Slayer enhanced strength, endurance and agility. This allowed the Slayer to single-handedly defeat the Dreadnought. As Samur acted without the Khan Maykr's consent, his actions was seen as heretical and he was believed to have been exiled from Urdak afterwards.
Samur eventually traveled to Earth and implanted his consciousness into a cloned human body as Dr. Samuel Hayden. Acting on the Father's mission, Samur acknowledged humanity will eventually discovered the power of Argent Energy on their own and he secretly guided them to prepare for the coming conflict with Hell.
The Seraphim is mentioned in the Slayer's Testament, specifically his role in bestowing the Doom Slayer with "terrible power and speed" to use against Hell's forces. He is depicted in a drawing from the "Book of Daeva" where the Seraphim is shown as a hooded figure watching as the Slayer fights with two Night Sentinels against demons that resemble the ones from the cover art of the classic Doom.
During the Doom Slayer's journey to Taras Nabad to recover his Crucible, he comes across the Chapel of Purity and the deactivated Divinity Machine; this prompts him to recall Samur (known in the campaign as the "Hooded Figure") helping him into the Divinity Machine.
Throughout the events of Doom Eternal there are several explicit clues of Samur being Hayden. Their names are similar, and Samur's lines in the flashback mirror some of Hayden's from DOOM (2016). After bringing Hayden to the Fortress of Doom, VEGA states that the architecture of the ship is similar to Hayden's body, and the humans in the ARC Complex remark that Samuel's body is "alien" - this suggests it was possibly based on reverse-engineered Maykr technology. Samuel also seems to have substantial knowledge of Urdak and even the Khan Maykr's weakness, as well as the portal systems in Urdak.
When the Slayer enters the Maykr facility with Samuel, the facility refers to him as the Seraphim. Furthermore, when VEGA is placed into an Urdak system, he asks Hayden if he is "the Father," indicating that VEGA may have been created from the Father's essence by Samuel after he stole it from the Maykrs.
Following the end of the Hell invasion of Earth, the Doom Slayer, Dr. Samuel Hayden, and the Armored Response Coalition embarked on a mission to find the Seraphim, seeking his help to seal Urdak, which have fallen to Hell, and preventing the demons from using the realm's higher dimension to renew their conquests.
The Doom Slayer journeyed to the UAC Atlantica Facility where the body of the Seraphim is located. Upon reaching the Seraphim's stasis chamber, Hayden transferred his consciousness into the Seraphim, and revealing that he and the Seraphim are one and the same.
Weakened due to his approaching Transfiguration and being unable to set foot in the Dark Realm, the Seraphim tasks the Slayer with braving the trials of the Blood Swamps in Hell in order to retrieve the Father's Life Sphere and returning him into physical form, allowing him to save Urdak from the demons and as well curing the Seraphim's Transfiguration. However, the Slayer proceeded to destroy the sphere right in front of the Seraphim for unknown reasons and further weakening the Seraphim in the process. Without any opposition, the Slayer took the Dark Lord's Life Sphere with the intent of using the Luminarium in the Holt of Urdak to give the Dark Lord physical form in order to destroy him. He leaves the Seraphim behind.
Upon the Slayer reaching the Luminarium, the Seraphim confronted him and trying to prevent him from resurrecting the Dark Lord. Soon after, the Seraphim is then consumed by his Transfiguration and engages in a fierce battle with the Slayer. Ultimately, the Slayer emerges victorious and prepares to kill the Seraphim, but only for the Father to rescue the Seraphim and grant the Slayer access to the Luminarium. His whereabouts and condition following this encounter are unknown, but he is presumed to still be alive.
- We have been allies for some time now. I knew who you were the moment you set foot in our world and who you could become to us. I brought you to the Divinity Machine, and gave you your power. Where would all of this be now, had I not had the foresight to create... you.
- Your "gifts" are owed to us now. Repay the Father for all he has granted us both by returning him to his throne - and then, he will save us all.
- Your reckless mission ends now.
- This... was not how it was meant to be.
- This must end!
- The name Seraphim is a celestial being from religions of Christianity, Judaism, and Islam. It is described as the highest rank of all angels from paradise, appearing as a heavenly creature with three pairs of wings. The plural suffix in Hebrew is "IM" (equivalent to an "S" in English), making Seraphim the plural of Seraph, meaning the name Seraphim could refer to a group of Seraphs.
- The name of the Seraphim, Samur, is most likely an allusion to the Hebrew Angel of Death Samael.
- Samur Maykr is voiced by Darin De Paul, who also voices Samuel Hayden.