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.
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