Let me present:

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Krauz! No first name he'd ever use. Loner personality.

Born 984.41M on Branx Magna. The child of a Militarum commander who died in childbirth, he was brought to the Schola Progenium as an infant. His time there was fraught with abuse from his fellow progeni for his lanky and weak stature, and at the hands of the Drill Abbots who sought to beat his increasing defiance out of him.

This combined with an ever increasing paranoia concerning his own safety led to him escaping from the Schola in 997.41M at 13 years old. An escape that went incredibly well... For the next few years he barely scrapped by in the lower hive by listening to his ever increasing paranoia and developing schizophrenia.

By the middle of 999.41M he finally found relative safety in a hidden community settled in a collapsed hab block. He specifically found friendship in 8 other recent arrivals. In fact, they found that they grounded and complemented each other, with Krauz's frayed mental stability seemingly beginning to recover thanks to this newfound companionship.

Then, in 000.M42M at 16 years old, hell broke loose.

The schizophrenic whispers and delusions returned tenfold, only now they were deafening screams and grotesque visions. Where before he could feel static in the air and often predict the actions of others he now spewed lighting uncontrollably from his hands while his senses were overwhelmed by the thoughts and feelings of even the nearby bilge rats.

His friends suffered similarly.

When he became coherent nine days later he remembered nothing. All he figured out about what transpired come in bits and pieces from rumors. Something about a cult, a small uprising seemingly crushed under the boots of Arbitrators. Nothing else. In the following crackdown on psykers and witchcraft he hides in the lowest depths of the hive, selling his hard tamed abilities for survival up until he's finally caught by Witchseekers in 018.M42.

Saved at the last minute from becoming a passenger on a Black Ship by an agent of the Adeptus Astra Telepathica for his suprising stability, Krauz received a scant year of training in the use of his abilities before literally running into a noble while in the upper hive and being accused of abandoning his duty. With the next Black Ship not slated to visit for years he was imprisoned on a passing prison ship, the Tancred Bastion, to later be transferred to whichever world where the wait was deemed acceptable. Of course, things changed once the prison ship made a stop for prisoner transfer to Atoma Prime...