[@Brink] Both ideas would be neat and interesting but I say lean for the techpreist since we already have 2 potential psykers barring the Inquisitor himself (Ollum and someone else I have been talking to on the RP's discord chat). A Secutor would grant the retinue some valuable technological expertise even if they are more combat oriented than Engineseers.

[@Andreyich]There's also the Demiurg, a Tau auxiliary race that are basically space dwarf nomads on giant ships. You can see them here:

[youtube]https://www.youtube.com/watch?v=StCXrBMl648[/youtube]