Direct answer
Complete the prerequisite: Yagluth Go to the location: Camp — The Bog Witch Choose a listed purchase; pay its price. Pay and purchase: Grasslands Herbalist Harvest ×5 — 160 Coins Pay and purchase: Grasslands Herbalist Harvest
The Bog Witch — Yagluth · Shop unlocks

Result
Complete the prerequisite: Yagluth → Choose a listed purchase; pay its price. Pay and purchase: Grasslands Herbalist Harvest ×5 — 160 Coins
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