Spirit Merchant (technically traded). Each of these marks the exact location of an outer biome boss spawn. Each scanner recipe uses a resource unique to the boss's biome. Either found on the ground or as a mob drop. Which isn't to say there aren't genuinely spooky areas and scary https://arthurbowaf.blogdun.com/30403746/quanto-você-precisa-esperar-que-você-vai-pagar-por-um-bem-core-keeper-gameplay