This is some utterly fascinating stuff you've got here, FO. Sheltem being programmed into the game as a boss is mind-blowing. I would never have thought was something that was ever planned since all the bosses in that game are optional, the lack of a final boss didn't strike me as unusual.



That enemy looks to me like something that would have been in the swamp areas.
Something about that strikes me as being an early version of the Flesh Eater/Rabid Leper/Gremlin/Kobold enemy.

There is no Werephase Mummy, per se, but Mummy is on the list twice. I don't remember this for a fact, but maybe there really are two different types? And the stronger ones are supposed to be the Werephase Mummy?
I haven't played this game in several years, but I'm almost certain there are two different Mummy enemies. They have the same sprite and name, but one has HP in the ~60s range, and the other in the ~88 range. There's something about the ones with the higher HP that makes them so much harder to fight that I would usually run from them, but I don't remember what. Maybe they have some insta-kill or rapid-aging ability?

I don't remember any of these. They all appear to be tavern clues. It's possible they exist but you might need to keep talking to the people in the taverns and tipping the bartenders over and over again to get them to show up. It also seems like some are specific to certain towns.
The "Check Walls" clues sound familiar, but I think when I tried checking where they said, I didn't find anything. I'm not sure about the others. I definitely don't remember the game ever telling me anything about the Hawkseye Hills dungeon. But like you, I probably didn't talk to the tavern people over and over again enough times.

On Lord Kilburn... I always thought, from his picture, the reason he was in exile was because he was cursed and turned into a monster - kind of like Beauty and the Beast, and I figured since he had the Desert map, he was probably the original king of Castle Dragadune. But knowing what we do now about that unused boss fight, your theory makes sense, too.

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The Highway Ends at the Iron Fence... Where the Diesel Trucks March By...