First up: Inquistior Stern, part of the Epheral Stern and Inquisitor Hand Forge world set.  I like Inquistiors so I traded Stern Away.

https://miniatureextravaganza.blogspot.com/2022/08/daemonifuge-ephrael-stern-and.html

And following with the Inqusitor theme some other 80s Inquistiors I have:

Inquisitor in Terminator Armor:

From here:

What is funny is I shouldhave all those models, just need to find them!  At least the other Inqusitor model!

Inquistiors in power armor:

And Inquistor not in Power armor but has a little secret he is not hiding very well.

The Realms of Chaos: Slaves to Darkness book really defined me for a generation.  Grey Knights and the Ordo Malleus, Slaanesh and the Emperor's Children were sunk deeply into my psyche.