The dragons have declared war on humans. Two of the seven dragon sanctuaries have already fallen. Will Wyrmroost be next? After a humiliating defeat at the hands of Kendra and Seth, Celebrant, King of Dragons, prepares to unleash his fury and take control of his native preserve. Armed with information from a new ally, Ronodin, the dark unicorn, Celebrant seeks the dominion stone.

The magical preserve Fablehaven provides refuge to numerous mystical species: centaurs, trolls, satyrs, ogres, fairies, minotaurs, brownies, imps, nymphs, and many others. But some beings are too large and powerful to be confined to regular enchanted refuges. These mightiest of creatures dwell inside the dragon sanctuaries.