The Heroes Round Table

And what about Tarnum and his different "incarnations"?

Yes, only the first campaign is directly linked to the main story. However, Kilgor is the one who wields the Armageddon's Blade during the HoMM4 intro.

The ones that are mentioned here are in the real order (as far as I know). I've only played through three of them so far though. Story's quite interesting. In the second game, Tarnum recounts the creation of Erathia and his defeat (and death) at the hand of Rion Gryphonheart. I won't say more so as ...