Doom Slayer

The Doom Slayer is one of the side characters of C2. He is one of very few survivors of demonic attack on Mars, and also responsible for killing the Mother Demon prior to becoming the Slayer, one of the people literally too angry to die. He also was responsible for killing the second Icon of Sin.

## Background

The Doom Marine was originally a human from Earth who served in the Marines and was dishonorably discharged due to assaulting his commanding officer after refusing to fire upon a crowd of unarmed civilians and was later transferred to the UAC Phobos base as security. The Marine soon found himself trying to prevent the demons of Hell from invading Earth. After having fought demonic hordes through Phobos, Deimos and Hell, he returned home to find Earth overrun by demons and his wife, child, and pet rabbit Daisy, among the billions of people killed, giving him further reason to pursue hunting the demons. He continued fighting the horde on Earth, before taking the fight to Hell once more.

Following this, the Marine was decommissioned. Some years later though, he was called upon again to fight the hellish force attacking a space station, prompting him to return to Hell where he defeated the Mother of All Demons. In order to save Earth, he decided to close the portal from inside Hell and continue the fight against the demons.

The Mother's sister, Resurrector, wanted vengeance, thus teleported him to Earth to kill him there. But he fought his way to Hell again and defeated her there. Once more, chose to remain in Hell to fend off the demons.

## Into the fire....

At some point, he somehow became stranded on the world of Argent D'Nur, ending up in a different dimension entirely after his indefinite stay in Hell (He was possibly sent there by demons, like the Resurrector sent him to Earth in Doom 64). There he is captured by the world's inhabitants, the Argenta, and brought before the Order of the Deag in Sentinel Prime. The Argenta were unable to understand his language and he was incoherent, as his mind was crippled with rage, and he only talked about demons. (Amusingly, they described his English as an "ugly tongue".) The Priests decided to put him through a trial by combat in the Blood Arena in order to judge on whether he would gain his freedom. Eventually, the Marine (dubbed as the "Outlander" by the Argenta) proved himself to be extraordinarily skilled and earning the admiration of the Argenta.

This garnered the attention of the clergy and ruling powers of Argent D'Nur, including the Khan Maykr herself, and despite being an outlander he was taken in and trained in their military, serving to spread the teachings of the Maykr race. Inevitably, Argent D'Nur was invaded by the demons and the Marine immediately entered the fight; in which his fervor for their destruction soon caught the attention of King Novik, who deemed him worthy to join the Night Sentinels. Initially the traditionalists of the Night Sentinels were very reluctant to allow the man into their ranks, as the Order forbids from having Arena-borne prisoners or foreigners. But over time, the Outlander earned their utmost respects as he proved his skills and unwavering determination at slaying Hell's demonic legions and becoming the Order's brother-in-arms.

The Marine participated in a pivotal battle against the Dreadnought, a monstrous Titan sent to lead a total demonic assault on the heart of Argent D'Nur. As the Sentinels were nearly overwhelmed by the demons, the Marine was approached by a Maykr, known as the Seraphim, who offered his help to defeat the Dreadnought. He was brought to the Chapel of Purity and submitted to the Divinity Machine, blessing him with fierce speed and great power to match his will. Using his newfound powers, the Marine took the Crucible, a weapon held for a true Sentinel warrior king, and using it to slay the Dreadnought and planting the blade inside the beast's heart. Since then, the Sentinels deemed the Marine as a chosen hero, and he gained his (in)famous title: the Doom Slayer.

The Slayer lead the Night Sentinels deeper into Hell, earning many victories and unwittingly allowing the Khan Maykr to build factories in Hell's domains to harvest Hell Essence to produce Argent Energy while endorsing the Slayer's name as the will of the Maykrs. The Slayer did not care about the polity of the Sentinels and the Maykrs, as he was too focused on destroying the demons, and consequently remaining unaware of the Maykrs' insidious secrecy of harvesting Argent Energy from mortal souls at the cost of working with the demons. After the truth of the Maykrs' betrayal was revealed, the Slayer remained loyal to the Sentinels opposed to the Khan Maykr.

After years of fighting in a civil war against both demons and the loyalist who sided with the Maykrs, an opportunity to end the war was supposedly discovered. At the behest of the Order of the Deag, the Doom Slayer accompanied the Night Sentinels to Hell in the hopes of securing a final victory against the demons. However, they realized too late that the priests had betrayed them to the Khan Maykr. The Slayer and the Night Sentinels were left stranded in Hell and endlessly fought the infinite demon hordes. One by one, the Night Sentinels were killed, save for the Doom Slayer and Valen, the latter of whom allowed the demons access to the Elemental Wraiths in exchange for his son's resurrection. When Argent D'Nur fell, Valen, now known as the Betrayer, chose to stay in Hell for the remainder of his days in self-imposed exile. The Doom Slayer, on the other hand, continued his endless killing spree.

Over time, the demons themselves grew to fear him. A Titan was chosen as Hell's champion and sent to kill the Slayer, only to be killed by him. Having failed to kill the Slayer at every attempt, the demons instead lured him into a Blood Temple before collapsing the entire structure on top of him. Trapped beneath the ruin, the Slayer was entombed within a sarcophagus and frozen in stasis within the Kadingir Sanctum (It is unknown why the demons didn't kill him). He would remain there for an extremely long time until he was found and recovered by an Union Aerospace Corporation expedition led by Dr. Samuel Hayden while procuring demon specimens and Hell artifacts. Hayden led his forces in defeating the demons that fiercely guarded the sarcophagus and taking the Slayer to the UAC facility on Mars. Upon identifying the Slayer and his armor from within the Helix Stone, and the developing suspicion of his employee and former protégé Olivia Pierce, Samuel had the sarcophagus hidden in a concealed location within the UAC facility. Upon suspecting Olivia's pact with Hell and her plans for the Mars facility, Samuel intended to release the Doom Slayer in the event of the UAC losing control of its demonic experiments.

## Before the 2nd invasion of Earthrealm

The Slayer is awakened after an unknown amount of time by Samuel Hayden during a demonic invasion of Mars triggered by Olivia Pierce. Upon breaking out of the facility he proceeds to Resource Operations to repair a satellite dish in order to get a complete picture of the situation. Hayden stops the Slayer from accessing the information in question and guides him to a VEGA terminal in order to give the Slayer an argent cell to improve his suit. The Slayer proceeds through the Foundry, stopping a meltdown by activating the terminals and then onto the Argent Tower itself. Despite instructions from Hayden, the Slayer smashes the filters channeling Argent energy to stop Pierce from opening a Hell portal. Despite this, upon reaching the top of the tower and confronting Pierce she uses an Argent Accumulator to break open the rift into Hell and warping the Slayer to Kadingir Sanctum.

He fought his way through the Sanctum to the location where his Sarcophagus was located in order to use the portal equipment left from a manned UAC expedition. Upon returning to Mars, he finds the UAC facility overrun with demons as the demonic portal allows them easy access to the red planet. He finally meets Hayden face to face and Hayden instructs him in finding the Helix Stone to locate the Well and ending the Hell invasion, as well implanting a program into his suit that will allow him to teleport the Slayer back to Mars. The Slayer traveled to the Advanced Research Complex and retrieves the BFG 9000 before proceeding into the heart of the cult activity on Mars. He proceeds to the Lazarus Labs and fights the Cyberdemon before using the accumulator that powered the boss demon to teleport him back into Hell. He then fought his way through the Titan realm and the Necropolis on his way to obtain the Demonic Crucible. After defeating its guardians he retrieved the Crucible and is greeted by ghosts of the Sentinel Knights. Before any exchange can happen, he is teleported back to Mars specifically to VEGA's primary facility. In order to reach The Well and cut off the power source keeping the portal on Mars open he has to overload VEGA's systems to rip open a portal to the Well. Before overloading VEGA's core however, the Slayer pauses and backs up a copy of VEGA onto a thumb drive he takes with him.

Finally, at the Well the Slayer fought his way to each of the Wraith bodies and uses the Crucible to absorb their energy to cut off the flow to the portal. Once the final Wraith has been disabled the Slayer is greeted by several Sentinels who stand guard around a pit leading to the final battle. Here he meets Pierce, bloodied and in shock that she was betrayed by her demonic masters. These same masters then hit her with a crimson lightning bolt, turning her into the Spider Mastermind, though it is ultimately killed by the Slayer. After this Hayden pulls the Slayer back to Mars and keeps him restrained by the teleporter. He takes the Crucible from the Slayer, stating he would use it to continue the production of Argent energy for humanity's benefit. Knowing the Slayer would attempt to stop this plan, Hayden teleports the Slayer away to an unknown location.

## The second invasion

Following the events on Mars, the Doom Slayer returned from his banishment with the Fortress of Doom controlled by VEGA. Later, he planned on having fun by killing some Imps in the Netherrealm. He later found a Baron of Hell fighting two people, then killed it, and later inspected one of them, trying to kill her, but the other person stopped him, saying she's trying to help them stop the demons. Slayer later gave her an "I'm watching you" look.