Farming the Meteorite Ore nodes in the Tomb of the Good Druid is probably the most efficient run, given that there's a spot toward the end of this area where you can sleep.

Ancient Meteorite Greatsword Stats and Requirements Ancient Meteoric Ore Greatsword is a Strength/Arcane-based weapon that requires 30 Strength , 19 Arcane , and 10 Dexterity to wield properly.