Ple-Sen
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Well, summons and buffs are more or less one-time things. But you have to cast lightning spells regularly, and they consume a lot of mana. Besides, you can reduce mana costs for up to two schools of magic, which means you get two free groups of spells right away. Dragons and enemy mages shouldn't pose much of a threat either, considering that enchantments can provide almost 100% resistance to elemental damage.