The Water Wingstone (Bounty name: Water Elemental Rock) is located at the bottom of the Forgotten Tunnel, in Nautilus Cave. The Water Wingstone is being guarded by a Pickaxed Golem. In order for this ore deposit to re-spawn, the player must "Sleep" in a bed.
This challenge is unlocked at the adept level, but you won't be able to do much damage to the Wingstone until you're at least a Master level Miner and are able to buy the Lava Pickaxe from Moley or craft it on a Blacksmith workbench.
Having a strength stat of at least 30 helps.
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