I've been reading D1 manual for a couple of hours today as I wanted to give warrior a try, Never beaten the game with a warrior. I have noticed that basically all the lore from the manual was carried to D2 ! Everything is there - Horazon (the boss of Arcane Sanctuary), Tal Rasha's Baal imprisonement and so on. And some more or less flavour lore related to the characters. It's greatly different with Warcraft lore where there was a great deal of changes and later corrections. Might give a spin to Diablo books too. Don't be angry for posting it at D2 forum, not D1 (which is basically dead - even as a MP game).