Jack was told by her mother, "The Kaczmar name meant something."
Back in the days where Sium was ruled by a Monarchy, the Kaczmar family held a great deal of important lands. They were rich enough, important enough, to have a great deal of influence within the system. Their name was important; the wrath of a Kaczmar often meant a great deal of misfortune for the offender. Perhaps some members grew corrupt--common history says of course they did, while the personal stories that Jack learned from the mouth of her mother said that they never did, that they were upright and moral members of society.
Regardless, the vast majority of the Kaczmar family tree was pruned when the Crux took their place.
Ofelia Kaczmar, the current matriarch, was only an infant when she was rushed to safety by a mother who knew the worst was coming. Ofelia Kaczmar, Jack's mother, grew up on the bitter grounds of defeat, the awareness that if she made a false move she would be seized and dashed apart. To prevent the untimely demise of a family line, Ofelia quietly extended her feelers, and it was an Elf man who she managed to settle down with.
Now, one might be led to believe that Jack was the firstborn--this would be false. She is the second, the latter half of non-identical twins. She was meant to be a spare, and nothing more than a spare. Nothing more than a second-in-command, a 'never-better-than'.
As a little girl, Jack was trained only somewhat in democracy; her actual role was meant as an attack dog for her sister. She was taught how to write and read, but not how to create grand plans beyond the instinctual level. She learned how to strategise in the battlefield. How to move units. How to give a good speech. But she was never taught how to walk well among the upper crust.
While both Jack and her twin had a natural affinity for Sillage, Jack's affinity proved to edge out her sister's, and she was given double the training--while she was allowed to be her own person (and a slightly dumb person at that), Jack was also slowly moulded into the ideal bodyguard for her sister--who the Kaczmar loyalists, hiding in quiet places, in dark corners and low alleys, called the hope for their family.
Which is why, when the family was attacked and more blood spilled, Jack did not hesitate to fling herself into the fray and display her abilities. With axe and sillage, Jack left a bloody path through the men and women who sought to bring her family down; she then fled with the survivors from Seracier down to Zhyphire.
Once the family had re-settled, Ofelia revealed Apocrypha's existence to her children--all the ones who had managed not to die on the rapid flight. They were told that they were part of the organization by rights--and Ofelia revealed her own demonic contract, which had saved the lives of some of the family as they traveled.
However, Jack's older twin had sustained heavy injuries during a fight on the run--regular bandits, lowly scum, had managed to wound her quite gravely. Jack watched, worried, wondered if she'd survive. Her twin made it through by the skin of her teeth and Jack was quick to enter into her own contract soon after, in order to protect her; Sillage amplified by work with a Draugr, Jack continued her protective quest--but she also took up cover as a blacksmith.
Along the way, Jack herself performed several back-room deals to keep some people quiet about the family's flight-trail, and this has left her bitter and mistrustful of women with particularly strong positions.
Her deal with Othynn came about through Jack's reflection on her family.
So many of them, she realized, had been wiped out by those with a blind hate towards the old regime. Jack rationalized it to herself: they had no proof of Kaczmar misdeeds besides those that had been fabricated (or so it was claimed by loyalists) by the Crux. Her sister had nearly died of infection.
Jack's journey into Alptraum itself was motivated simply by a desire to track something down, something that could help her
get vengeance protect her sister. She thought of the humiliation she had endured to make sure nobody could track her family, and she thought of the fates of many of her younger sisters--dead, gone.
So she came upon Othynn in those pits. The All-Father (as he called himself) had his loyalties; he'd been cursed there, pinned in Alptraum, but he knew how to manipulate and how to get what he wanted. Jack's stay in the dead-realm came to an end when she left with a contract forged with an Arch-Demon.
Her position as a Demon Knight followed soon afterward.
Jack remains in Zhyphire, a berserker in plain sight, her work as a blacksmith keeping money flowing in to the family.
Unfortunately, nothing ever lasts long.
Jack, full of valor and fire, engaged with Crux Fidelis dogs. This was a trap, and by the end of the fight, two things had become agonizingly clear; Jack had been set up, and Othynn was not the ally he had presented himself as. Pinned to a wall by a pipe, Jack writhed in pain and howled her defeat, only to be told what was to come.
Sourdeval Duchamps, Head of Sillage Studies, wanted her.
Apocrypha was shaken by what happened, then: Jack was reported missing, abducted. Jack herself spent the better part of three years hidden away in a research base for Welts, her immortal state abused and manipulated. Sourdeval tested all sorts of things on Jack's flesh, and even loaned her out to other departments to test weapons: she was kept in line with an explosive collar that would kill her the moment she flared up any of her powers.
When she was released, it was with one condition: there was an explosive device implanted within her, and if she failed to do as told, she would explode--the danger of it was not the damage to herself, but the damage to others. It's been enough to keep Jack as in line as she can be kept, though she has begun to try and find a way to get the explosive out of her.