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Essence Crystal is an item added by Tinkers' Construct. They are used to store levels via Essence Extractor. Once used (default right-click), it will give the player exactly the level written in tooltip.
- It will stack only if the level stored is exactly same.
- In previous versions of Hexxit, blue Villager trades these crystals for other Tinkers' Construct items, and it does not have any uses apart from trading, nor it was obtainable legitimately.