I was wearing Arkaine's Valor at 21.

Fireball is nice, though I don't really like Lightning and Guardian all that much. I really prefer chain lightning to fireball when I can help it, but sometimes stupid immunes prevent my chain lightning killingness.

I can't remember, but I think you can get books of nova in Diablo 1. But if I remember right, Nova isn't as good as it seems, as there's only 1 square of lightning that passes through the target, rather than tons with chain lightning.