Fantasy Saga M (Chronicles of the Millennium) (Volume 2)

The tower built ages ago, a device to turn the planet into a weapon using its shear life force grows close to activation. Seren finds himself thrust back into the past, his fate again altered by the temporal anomaly known as the Temporal Triangle. Now back to where he started, Seren and company seek to stop the Emperor Blade before he amasses the power he needs to activate the Sore upon the face of the planet Terra.