Ainz Ooal Gown decided to become a famous adventurer and lived in the city for a while, so that he can gathered more information about the new world and its combatants. For that reason, he picked Narberal Gamma as his adventurer partner to accompany him during their journey together. The group disguised themselves as adventurers under the names of Momon and Nabe. They also started their adventurer debut at E-Rantel and formed the group there as home base.
It is an adventurer group consisting of only two members in the team. Though the team lacks a support type (divine) magic caster, however, they were able to still managed to achieve several astonishing feats in succession. They've also registered the Wise King of the Forest in the group's ranks right after it became Momon's pet and his mount to ride on during the course of their adventure together. It only took the group around two months at most, since their debut in the Adventurer's Guild to carry out various feats which quickly spread news throughout the Re-Estize Kingdom.
The Dark Warrior Arc
- Main article: The Dark Warrior Arc
Darkness first debuted in E-Rantel, where they start off as copper class adventurers, the lowest rank. Their first job was to escort Nfirea Bareare to Carne Village along with the Swords of Darkness and help him gets some herbs from Tob Forest which they easily achieved and Momon also managed to tame the Wise King of the Forest.
Darkness were requested again by Lizzie Bareare, the grandmother of Nfirea to save his grandson from the unknown group, who kidnapped him. They went to the E-Rantel's cemetery, and faces the mob of the undead and they managed to breakthrough. They met the two instigator, who were performing a death ritual. They managed to kill them and foiled their plan before they set it in motion. They were promoted to mythril class adventurer for resolving this incident.
The Bloody Valkyrie Arc
- Main article: The Bloody Valkyrie Arc
Kralgra, Sky Wolf, Rainbow, and Darkness are summoned as mythril class adventurer groups of E-Rantel to discuss the appearance of the powerful vampire, Honyopenyoko. Momon convinces and insists that Darkness would fight against Honyopenyoko alone, arguing that if others became involve in the fight will only increase the number of victims. Sky Wolf and Rainbow accept his suggestion while Kralgra ignored his advice and chose to follow which resulted in getting his group killed.
The battle with the vampire ended with Momon successfully killing the vampire in an intense battle. The Adventurer's Guild later examined the aftermath of the battle and came to the conclusion that he had truly killed the vampire. They are then promoted again this time to adamantite class adventurers, the highest adventurer rank attainable, said to be the pinnacle of human strength. They became the third adamantite class adventurer party in the Kingdom. They became extremely famous and this allowed them to monopolize all mythril class quests in E-Rantel.
The Men in the Kingdom Arc
- Main article: The Men in the Kingdom Arc
Darkness was hired by Marquis Raeven to enhance his estate's security in the wake of the recent disturbances and he really wanted to suppress the criminal group known as Eight Fingers. However, their request has change with the appearance of Jaldabaoth and his demon army, looking for a certain item in the royal capital.
During the disturbance, Momon, Nabe and Evileye faces Jaldabaoth and his battle maids while Lakyus of Blue Roses is leading the adventurers to fight against the demon army in the royal capital and to prevent the demons from spreading deeper into the city. After the disturbance, Momon became the hero of the Re-Estize Kingdom and returning back to E-Rantel.
The Invaders of the Large Tomb Arc
- Main article: The Invaders of the Large Tomb Arc
Darkness was hired by Count Femel to escort the workers to the mysterious Large Tomb in the territory of Re-Estize Kingdom and alongside with the adventurers of the Baharuth Empire. They were in charge of the protection of the encampment near the Large Tomb while the workers explore the tomb. However, no word from the workers came and are believed to be wipe out inside the tomb so they left the tomb.
The Magic Caster of Destroy Arc
- Main article: The Magic Caster of Destroy Arc
To prepare for the annual war, Crown Prince Barbro suggested that the Royal Army conscript the adventurers, especially the adamantite adventurer group, Darkness. Baron Cheneko supported the idea wholeheartedly. Due to his enthusiasm, King Ramposa III gave him the mission of recruiting Darkness to the Kingdom's cause. Cheneko failed in his mission, as Nabe rebuffed him stating Momon was on a solo mission.
During the Sorcerer King's procession into the newly conquered city of E-Rantel, Momon defended a young boy and his mother before the cortège. While Albedo was prepared to execute the upstart, the Sorcerer King, impressed at the hero's defiance, relayed orders to Albedo and coerced the adamantite adventurer into servitude lest there would be a massacre of the remaining humans within the city. Outnumbered and seeing no alternative, Momon accepted the term, swearing Darkness to become subordinate to the Sorcerer King and responsible for killing any rebels. It was thanks to this that the inhabitants of E-Rantel remained passive under their new monstrous king, refusing to rebel, lest they tarnish Momon's reputation.
The Paladin of the Holy Kingdom Arc
- Main article: The Paladin of the Holy Kingdom Arc
The exploits of Darkness had reached the Roble Holy Kingdom. However, some pieces of information were distorted, causing others like the Holy Kingdom's envoys to misinterpret it. For instance, the battle in Re-Estize against Jaldabaoth, who they presumed to be a medium level demon was defeated by an adamantite adventurer made Remedios believe that she can beat him too.
When emissaries from the Holy Kingdom Liberation Army came to Re-Estize, they learned of the exact details concerning Darkness from Blue Roses. Remedios thought Momon within the group must have use some sort of special item to defeat him, but Evileye, a witness of his battle with Jaldabaoth denied such claim. Gustav then intervene into the conversation, questioning if Darkness could've exploited Jaldabaoth's weaknesses and Evileye believes it is possible doubtfully.
While the Liberation Amy intended to recruit Momon to fight against the Demon Emperor Jaldabaoth, their request was rejected by the Sorcerer King. The Sorcerer King, Ainz Ooal Gown declared to the envoys that this is because Momon's presence is needed in E-Rantel, so he could maintain the city's peace as its enforcer.
Darkness was said to be the most powerful and strongest adventurer party out of the three groups in the Re-Estize Kingdom. This was evident enough for other adventurers to see in Momon as someone, who has reach the pinnacle of what truly defines adamantite to be. With only a warrior and a magic caster, it is thought to be next to impossible to resolve the many dangerous incidents that they are capable of resolving. Even Evileye herself closely estimated that Momon's and Nabe's strength are the work of inhuman feats, believing them to be God-kins, who has the blood of a player. Out of all the warriors Evileye has came across in her lifetime, she concluded that he is the strongest warrior by far.
- Momon did not name the group "Darkness" at first. It was just a common name originating from his jet-black armor, and Momon eventually accepted it as the proper name.
- Pandora's Actor is used as a body double for the Adventurer Persona "Momon," whenever Ainz is not around to lead the group.
- In a short amount of time while they are new adventurers, the adventurer group, "Darkness" was able to quickly ascend from the first rank of being a copper to mythril and then finally its final rank, adamantite. The group have manage to skip ranks rather than going through it by order accordingly.
- Unknown to the public, it seems this adventurer group, "Darkness" is the only one right now who is completely made up of non-human individuals.