The Ironlords: Book Six of the Triads of Tir na n'Og

The Triads have flushed their prey into the open. Now at last the secret is out: the conspiracy to overthrow the all-powerful Fey is driven by the Ironlords, the Fey's mightiest servants and avatars. Led by the legendary Ironwolfe, they have shaken the rule of their magical overlords. But the threat of revolution pales in the face of the horrors brewing in the Mists and waiting to overrun all of Tir na n'Og.
Faced with the destruction of all they are sworn to protect, the Red, Blue, and Green Triads forge a pact with the Ironlords. But can even the unleashed power of the Ironlords and the courage of the Triads save Tir na n'Og from the unthinkable…a monstrous foe who can overcome the greatest of the Greater Fey?