Geomancer – The Well of Echoes (Book 1)

Geomancer

Two hundred years after the Forbidding was broken, Santhenar is locked in war with the lyrinx. Despite the development of battle clankers and mastery of the crystals that power them, humanity is losing. Tiaan, a lonely crystal worker in a clanker manufactory, is experimenting with crystal when she begins to have visions.