Warrior of the Three Moons — J. Michael Robertson

In an age long past the Gods walked the land and warred among themselves in the great war men named the God Wars. In that terrible time the Dark God was locked away in the Otherworld of Tir na Scil, the Land of Eternal Shadow, by the Gods of Light, the Shining Ones. Now he again reaches out to touch the world in search of an ancient weapon forged by the Smith God. If he finds it the Long Night will fall forever over the lands of men.

Waiting in his room to be summoned to the Hall of Mirrors to receive his penance for violating the Goddess Danus Sanctuary, Ciarn, a young Celtae warrior, is enveloped in a golden light and given a perilous questjourney across the Forbidden Lands, the realms of the Dark Gods powerful Psians, the Ring Lords, and find the Sunspear before it falls into the hands of the Shadow. In the crucible of the Forbidden Lands Ciarn learns the true price of being a Psianthe constant struggle he must wage against his Darksoul each time he opens a vortex to his Psi, the vast psionic power of the inner mind. If his Darksoul escapes into his conscious mind, he will become a creature of the Dark God.

Book I of The God wars of Ithir, Warrior of the Three Moons begins the great quest to claim the Sunspear by Ciarn and his companions: The one-eyed Battle Druidess, Scthach, The mysterious Red Druid, Oisn, who teaches Ciarn to use his psionic powers, and the tiny Sean Priestess, Rillsong, who lays claim to his heart.