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Whitehorn Mines, Reservior, in a mine cart in a long tunnel leading to the drain lever. At the end of the quest The Boiling Foundry, you will get a message and Archeron's Mines Teleporter from Eternity. Use the Teleporter cube in your inventory to get to the mines.
All equipment from The Wheels of Lull can be tempered with a Technomantic Ingot on a grindstone or workbench.