I have again started The Tombs of Atuan by Ursula K. Le Guin, the second book of her Earthsea Cycle.
The wizards of the Archipelago know better than to pay homage to the Old Powers of the Earth, but the white-skinned Kargs are not so wise. This is Tenar's tale; the story of a realm, a secret treasure, and a meeting in a lightless dark where the sun has never shown. A quest to reforge the Ring of Erreth-Akbe, a chance to escape.
"The Old Powers of earth are not for men to use. They were never given into our hands, and in our hands they work only ruin." - Ged