The Black Geode
A possible magic item referenced in the writings of Marlos Urnrayle. There were references to The Black Geode which was linked somehow to The Evergrowing Mountain which seemed to be some powerful individual or deity who was said to use The Black Geode to remake the earth in his own image.
After using a suggestion spell to interrogate a priest of the black earth cult, the party learned that The Black Geode is a place that sits beneath the Monastery of the Sacred Stone down the winding staircase that was blocked by the earth elemental myrmidons.
It is a place that Marlos Urnrayle now dwells. There is an earth elemental node down there.