SoulDrinker
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You can, but it's risky on a large map; a fighter is much more reliable. But in general, it all depends on the template and the map (on many fixed maps, it's preferable to level up a mage rather than a fighter, as the red orb and cloak are disabled, and there are many places to replenish mana).
Take intelligence with mysticism for the Jedi, and after visiting the mana vortex, you won't know when their mana will run out.