Count-Assassination

Born in EC 110, Karchess eventually became a count of the growing Marlon country. At some point, he became friends with Baron Toy Conchita. Later, Karchess met and entered an affair with Yufina Marlon, eventually telling Toy; sometime afterward, she left to travel to Beelzenia as part of her husband's homecoming. Before leaving, she gave Karchess the Golden Key and, under the presumption that it was a type of advanced technology, he would become aware of its power and capabilities.

Around the summer of EC 136, the count was asked by Princess Maylis of the Beelzenian Empire to investigate the disappearances of women across Asmodean, Yufina being among the missing. The Count agreed to assist the Empire and spent nearly a month investigating the incident.
While reading through the list of disappearance cases in a local pub, he noticed Lilien Turner's name on the list and began focusing on it. After a thorough investigation, Karchess learned of the rumors surrounding Turner's disappearance and the mass murder of the Ferdinand family in their estate around the same time.

Traveling to Mystica, Karchess arrived at Earl Ferdinand's Mansion but was blocked at the front gates by the estate's guards before the earl granted him permission to enter. Seated in the mansion's dining room, the Earl expressed pleasure in meeting the Count and apologized for the his cold welcome at the gates. Ignoring it, Karchess noted that the earl's entire family had been massacred and Ferdinand asked if he had already heard the stories about the supposed culprit.
Karchess replied that he had once but doubted it and the earl explained how his family and the chamberlains were found dead around the same time a woman disappeared. Continuing to extract the earl's knowledge of the local rumors, he became interested when the Ferdinand mentioned that only one person had a contradicting testimony of the recent events, asking who it was. The earl stated that a peasant farmer and friend of Lilien, Rajih, had absurdly claimed Duke Sateriasis Venomania killed his uncle's family and stole Lilien despite the fact no one saw the duke at all at the time.
Interested, Karchess pursued the lead and found Rajih drunk and ranting about the futility of trying to beat the duke. Scoffing at his reason for giving up, the count told the farmer that anyone drinking endlessly over losing their lover was a miserable existence. With Rajih's reply that Lilien was his childhood friend, not his lover, Karchess brushed aside the comment.
Ignoring the peasant's question of who he was, Karchess instead answered that he wanted to hear Rajih's story about Sateriasis and Lilien. Told a second time to introduce himself, Karchess revealed his name but was taken aback by Rajih instead getting up and walking away. The count asked why he wasn't satisfied and Rajih responded that he was but didn't want to talk about it.
Karchess immediately grabbed the farmer by the shoulder, holding him in place with his one hand. The count explained that, despite their different social statuses, he could be his "savior". Intimidated, Rajih asked if he was a foreigner and Crim explained he was simply a normal man from Marlon. Rajih replied that he was just a farmer and that they had nothing in common.
Responding that his way of thinking was despicable, Karchess explained he had three things to tell him: the first being his name and the second being the need of strength to regain lost love. Pulling out the Golden Key, he declared the third was that there existed a weapon capable of defeating a demon. After hearing Rajih's full testimony, Karchess sent a report to Maylis of his progress in the past month.

KachessasElluka
Karchess approaches Venomania while in disguise
At some point, Karchess met the mage Elluka Clockworker at the Lasaland Inn, who explained that the Golden Key he carried was a vessel of sin; making an agreement to hand it over after the duke was defeated, Karchess joined forces with the sorceress.
Afterwards, he became infuriated by her insistence that they wait to approach the duke, fearing for Yufina's safety, and they entered a heated argument. Following the meeting, Karchess mentally apologized to Toy and deviated from their original plan.
With the Golden Key transforming into a knife, Crim disguised himself as Elluka and approached the alleged demon in his mansion. After allowing Venomania to believe he'd exerted his powers over him, Karchess followed the duke into his basement. Once Venomania embraced him and asked him to dance, Karchess stabbed him in the chest with the Golden Knife.
He then called the duke a fool and shed his disguise as Sateriasis collapsed to the ground, expressing his incredulity that the duke actually fell for his disguise. After triumphantly exclaiming that he had killed "Duke Venomania," Karchess left him to search for Yufina. Freeing the captured women, including his beloved, Karchess and Yufina fled Asmodean and eloped; due to their activities, the two became fugitives of both the Beelzenian Empire and Marlon.