Sage
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I only take Earth and Air, as I most often use the slow and haste spells (and also town portal, dimension door, and fly, although I usually play on medium-sized maps, so I don't always need them). I take Water and Fire if, along with one of them, some unnecessary skill is offered as an option, although Berserk is a powerful ability (and in TE, town portal is also available in Fire magic).