Golden Chalice

Of everything your Claws pull out of the desert, the Golden Chalice is the jackpot: the rare digging find, supreme rarity, worth 150 Khron apiece if you sell it. Selling is almost never the plan, though: this is the one relic that both the Portal to the Archipelago and the two Supreme tools demand at once, so your whole third continent revolves around how many Chalices you are holding. No other mid-game material gets pulled in so many directions — which is why every one sold out of impatience stings later.