Magician, the Arcana of Talent.
Few indeed could claim to be truly talented, truly skilled: though there were those oddities whose ability outstripped their peers, the vast majority of humankind had limited potential, forming an unremarkable baseline that was made up for with numbers, technology, and industry, each of these a poor substitution for proper ability.
You were not the same. An exception, an anomaly in the sheer capacity of ability you could develop. With time and training, you could achieve a degree of skill and ability such that you could alter the very axis of fate...
But of course, that depended on being able to grow and evolve. No great oak begins as such: they always start as a mere seed, and to grow, a seed requires soil. From what soil did you grow, little tree?
[ ] Laernaea: Located in Segmentum Obscuris, Laernaea was one of the handful of worlds registered as a Poison World. The result of a failed virus bombing centuries ago, 99% of Laernas surface is covered in lethal poison, and all of its flora and fauna are deadly toxic. Having but a single hive city upon its surface (though a number of smaller self-contained installations dot the surface), the main export of this wretched mire of a planet is the lethal compounds it holds in abundance, with the chem-factories churning away day and night to produce useful chemicals from the complex petri-dish of Laernaea, from dread combat drugs such as Hydra, to various bio-solvents used in industrial works by the sectors assorted forge worlds, to more...clandestined products.
Potential Starts: Swamp Dredger, Factory Chymist, Data Clerk
[ ] Ctheradon: Located in Segmentum Ultima, in the distant past the hive world of Ctheradon rebelled against the Imperium, led by servants of the ruinous ones. It is said that the angels of death subjugated it, wresting it away from a sect of their fallen brethren who sought to damn the world and its people forever. Of course, that was centuries upon centuries ago, distant history. Yet the taint of that conflict still lingers, a reminder of the worlds sin that manifests as a vast abundance of mutation: it is said that in that darkened, blighted place, one in every seven children are born deformed and twisted. In the upper hive, most of these infants are destroyed. However, the lower you went, the more common it was to find menials and beggars with odd deformations, and in the deepest, darkest parts of the Hive, it is said that dark, unholy things lie, in the grave of those heretics that had long ago attempted to conquer this world...
Potential Starts: Street Doctor, Ganger, Courier
[ ] Tarrghus: Located in Segmentum Tempestus, Tarrghus has long been blighted by its own woes: during the War of the Beast, it was conquered by an army of greenskins, and was but barely retaken by the Imperium, with many ruins of orkish make dotting the planet, frequently host to congregations of feral orks, the offspring of those ancient conquerers. Technically classified in the imperial registry as a civilized world, in reality it is anything but: each continent is home to but a single city, each a hyper-industrialized fortress designed to regularly purge the feral orkoids that plague that realm, with a twisted, brutal wilderness inhabited by bands of feral orks, vicious animalistic monsters that have evolved to an exceptional degree of violence due to the enviromental pressures of an orkoid infestation, and the primitive, shamanistic tribes descended from the freed slaves of the Ork army that once conquered the planet.
Potential Starts: Suppression Squad, Tribe Brave, Archaeologist