I've been reading the HH series since '08 and fairly sure I need to start again to find where some of the more niche and interesting characters have been left. Sevatar has always been a fan favourite, probably due to NL's dark humor that pervades their writing which is definitely a reprieve from the likes of Guilliman's statesmanship. IIRC, Sev's last appearance was as a captive of the 1st Legion in The Long Night. Those of us at the SoT books probably have wondered where Sev or the NL are - there's an occasional reference to them as a legion but we've nothing individual to focus on. We're also near the end as well. While I highly suspect Black Library will push out a load of novellas to drag the storyline out, I'd really like to see more from the perspective of those who aren't the big players. With Sev included in this, I do recall that ABD intended for his development to be padded out post heresy. I just hope we see a little more of 30k Sevatar before then. He's a fan favourite, has enough plot armor to go toe-to-toe with Ciaphas Cain, and is far more interesting than his edgelord of a Primarch.