Why not use power increase on firebolt instead of sp decrease? Since fb naturally cost very low amounts of sp and the total drain at earlier levels (with mm/fb/ib/lb) combined would still sum to a very low amount of drain, also increased firepower helps with soloing as you kill the mob faster. Just a personal opinion, correct me if I'm wrong. Another question to ask is do you consider the earlier skills useless at higher levels (firebolt/ice bolt/lightning bolt)?
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