The Purple Spiky Thing acorn is a place-able item that places a demon altar.It looks like a black acorn

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To craft it you need

50 acorns (dropped by trees)

10 vile powder (from vileshroom or from the dryad at blood moon)

You can actually spawn hardmode ores from the altars spawned (Fact - The Name "purple spiky thing" was the first name for the demon altar)

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