So I've been researching good, fun (FREE) old roguelikes to
waste time with
play, and I just found this one for DosBox: Ragnarok
-from the download page.
In terms of complexity and depth I've seen it compared to Nethack, and it has ridiculously deadly fauna, such as Hel Dragons that always know where you are, teleport to your position, and butcher you. Apparently there are all kinds of insane things in this game like stealing bodies and fighting Norse Gods, but I'm still figuring out the early game so I haven't tried it yet.
I'm also looking for a link to the old spoilers file for this game; based on my research it was formerly widely available on the internet but not so much anymore, and my leads are growing cold as websites naturally suffer attrition. If anybody would be willing to share either that or any hints/experiences with this game, I'd appreciate them!