What paths could a Tech Priest take who had the Malygrisian Talent? He wants to study dark Biologis arts. What kind of cool advancements and talents/ewuiptements could he gain with XP

There is a Genetor alternate rank in Rogue Trader's Into the Storm. It has a special Talent which lets one purchase certain Mutations and Traits as "grafted biological systems or manipulations of own genetic structure". It's pretty fun, you might want to look it up if you get a chance.