[@Jbcool] Very interesting setup. As for deliberately converting somebody into a psyker, I don't know of any way to achieve that effect beyond worshipping Tzeentch and hoping he mutates you into one - which is guaranteed to end badly, of course - but it's possible for psykers who can control their powers (Iota level and above, which marks the bearer as a "true" psyker by Imperial standards) to improve them with practice, as well as for psychic ability to atrophy with lack of use. Omicron through Kappa designations indicate minor psionic ability, but people at these levels don't have any particular conscious control over their powers, and can't really train them to manifest accordingly. In short, you need to have it to get more of it, and as a normal human, you don't necessarily want more of it in the first place.