A pendant with cerulean amber insets.

Dramatically boosts maximum Focus Points (FP).

The aged sap of the Erdtree transforms into amber, cherished as the most precious of jewels in the era of Godfrey, the first Elden Lord.

Inside, a primordial life energy resides.

How to get it:  Locate in Lunar Estate Ruins. Found in a treasure chest in an underground room northwest of the ruins.

Look for an Imp Statue pressed up against the wall. This requires one Stonesword Key. The stairs are also concealed by an illusory floor. Simply hit the floor next to the Imp Statue to reveal the stairs.