Direct answer
Complete the prerequisite: The Elder Go to the location: Camp — Haldor Choose a listed purchase; pay its price. Pay and purchase: Ymir Flesh ×1 — 120 Coins; Thunder Stone ×1 — 50 Coins Pay and purchase: Ymir Flesh / Thunder Stone
Haldor — The Elder · Shop unlocks

Result
Complete the prerequisite: The Elder → Choose a listed purchase; pay its price. Pay and purchase: Ymir Flesh ×1 — 120 Coins; Thunder Stone ×1 — 50 Coins
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