In Gilded Strand you will find three Greater Earth Spirits that are each under assault from three Golden Maw Runesappers. Kill the Runesappers and then use the Earthwarded Receptacle on the spirit.
Prime the Earthwarded Receptacle on the beach, then cleanse yourself in the stream.
Karris appears and tells you that the Whispering Gem you gave to Anthousa was planned, by him, so he could trap her, then he vanishes. Sylver Valis runs up, says he heard the whole thing, and that you must meet him at Searing Brink if you are to save Anthousa and stop Karris.