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From "Yahoo Answers"
if you're a guardian, you can just refill the mana potions at Warlics shop or a blue potion bag. However, if your just an adventurer, go to the guardian tower, and do the huntress chase quest. Get warlic as your temporary ally. Then go to the stat trainers and train with the mage trainer in only magic. with marlic backing you up for extra damage, you should have enough mana left to have the 1-2 potions the trainer should have given you. then, rest at the inn. Repeat. If it becomes to expencive, you can tone the price down by dying and finding the stat detrainer in the underworld by clicking deaths hourglass and searching for a vortex sending you to the graveyard.