Is this all correct with the colon?

After a short visit to Thentia to obtain enchanted equipment from their wizard associates, Dorn Graybrook and his companions traveled to the first location that Sammaster had visited in his investigation of the Rage, Northkeep: an ancient human city on the Moonsea that had been sacked a thousand years before and whose conquerors performed a magical rite to sink the very isle on which it sat.