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This is a Slime Science Advanced DLC item.

The Fossilized Hen-Hen is a rare item that sometimes appears when Rock Slimes (or Rock Slime largos) are fed meat. Once collected, they can be processed by the Energy Extractor in the Lab and are turned into Energy Barrels. Energy Barrels are essential for fueling many machines and items in the Slime Science Advanced DLC.

Henhenfossil

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