> Then I learned the 60+book series of multiple Authors that was ending very soon. I was disappointed by GRRM abandoning his abandoning GOT for prequels and Robert Jordan dying, so I've been loathe to start series that aren't finished.

Ironically, the 60+ book series is the prequels. 40k is the "main timeline", 30k is more of a flashback.

> Ferrus Manus has iron hands

You forgot that he leads the legion named the Iron Hands.