After several thousand hours of playing, I found an Adventurer NPC who wasn't already dead. Actually, he was kicking it in Fort Black Boot. I've found dead adventurers before. Intrigued, I hid in the shadows as he slew a Conjurer, a Daedroth and a Spider Daedra. I did restore his health once. He went back to the entrance, so I cleared out the rest of the fort and then had an intersting conversation with him. Anyone else had this experience?

Ah, the Orc Adventurer. Sounds like you were unlucky, I've run into him much sooner than that and many more times. Funny thing is that though he bangs on about bringing loot back to Gortwog for the glory of Orsinium, he never seems to collect any himself. Nice chap, though, on the whole.