The Temple of the Sun by Moyra Caldecott

The Temple of the Sun is the second book of the Guardians of the Tall Stones series.

Kyra, the courageous young psychic we met in The Tall Stones, undertakes the hazardous journey with Karne and Fern to the Sacred Temple, where Kyra is to receive her training as a priestess and renew her love for the Lord Khu-ren. But a malevolent spirit still opposes them, and its influence has already permeated the sanctity of the Temple. Kyra is forced once again to face the evil Magician-Priest, Wardyke, whose thirst for revenge and power threatens the balance between good and evil...