To get one of the best Pickaxe/Axe in the game you'll have to kill the Golem and hope for the best. It has a 12.5% drop chance so it should pop up at some point. It's really an amazingly fast Pickaxe and even doubles for an overpowered Axe.
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The Picksaw is a drop from Golem, one of the four bosses introduced in the 1.2 patch. Holding an...