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"This crystal was made using lost technology. At one time it was the power source for ancient machines. This item is very valuable to researchers."
The Ancient Core is a material found in Breath of the Wild. Up to two Ancient Cores can drop as a random loot from Guardians. Note that only Guardian Stalkers, Guardian Skywatchers, and Guardian Turrets will drop this material. This material can be traded with Kilton, in his shop, the Fang and Bone, for 40 Mon each, but its main purpose is creating ancient equipment at the Akkala Ancient Tech Lab. Ancient Cores are used in the manufacture and the enhancement of the Ancient Armor, including the Ancient Helm, Cuirass, and Greaves.