The Well of Echoes Series by Ian Irvine

Two hundred years after the Forbidding was broken, Santhenar is locked in war with the lyrinx - intelligent, winged predators who will do anything to gain their own world. 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 an entirely new kind of crystal when she begins to have extraordinary visions... moreTwo hundred years after the Forbidding was broken, Santhenar is locked in war with the lyrinx - intelligent, winged predators who will do anything to gain their own world. 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 an entirely new kind of crystal when she begins to have extraordinary visions. The crystal has woken her latent talent for geomancy, the most powerful of all the Secret Arts - and the most perilous. Falsely accused of sabotage by her rival, Irisis, Tiaan flees for her life. Struggling to control her talent and hunted by the lyrinx, Tiaan follows her visions all the way to Tirthrax, greatest peak on all the Three Worlds, where a nightmare awaits her. less

Santhenar is on its knees. War with the forces from beyond the Void shows no sign of ending, and there is worse to come. The future of the world now rests in the hands of just three flawed individuals: Tiaan, Nish and Irisis.

The Node has failed, rendering humanity's battle clankers and the Aachim's constructs useless. Hordes of alien lyrinx are swarming from the tar pits of Snizort. The fate of humanity is dependent on one wily old man, the Scrutator Xervish Flydd. But he has been condemned to die a brutish death.

All resistance has been crushed. In a few minutes of overwhelming violence the Council's air-dreadnought fleet has destroyed Fiz Gorgo's defences. Xervish Flydd, Irisis and their allies have been condemned to die in a brutal aerial spectacle designed to reinforce Chief Scrutator Ghorr's power and majesty. Nish is their one remaining hope. But Nish is trapped in a burning watchtower, and hunted by both the scrutators and his former lover, Ullii, whose twin brother he accidentally killed... moreAll resistance has been crushed. In a few minutes of overwhelming violence the Council's air-dreadnought fleet has destroyed Fiz Gorgo's defences. Xervish Flydd, Irisis and their allies have been condemned to die in a brutal aerial spectacle designed to reinforce Chief Scrutator Ghorr's power and majesty. Nish is their one remaining hope. But Nish is trapped in a burning watchtower, and hunted by both the scrutators and his former lover, Ullii, whose twin brother he accidentally killed. Before Nish can hope to rescue his friends, he must convince Ullii to spare him, then overcome the most powerful cabal of mancers in the world as well as the Council's four hundred crack guards.And even if he succeeds, to win the war the allies still have to defeat the scrutators and overthrow Nennifer, the corrupt Council's dread bastion, before the rampaging lyrinx overwhelm all Santhenar. less