Direct answer
Defeat the target: Serpent Go to the location: Camp — The Bog Witch Choose a listed purchase; pay its price. Pay and purchase: Seafarer's Herbs ×5 — 130 Coins Pay and purchase: Seafarer's Herbs
The Bog Witch — Serpent · Shop unlocks

Result
Defeat the target: Serpent → Choose a listed purchase; pay its price. Pay and purchase: Seafarer's Herbs ×5 — 130 Coins
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