A cutscene will play, detailing the use of the stone to activate Construct 8. You'll be given the Aquarius Stone for your efforts. The archeodaemons Syneugh and Ahriman of the final round can be quite irritating, so try to end the battle as quickly as possible by nuking down Syneugh.
You'll be brought into a series of battles, where your primary objective is to rescue Reis, a mysterious dragon with whom Beowulf is closely connected. You'll encounter Beowulf, a Templar looking for your help cleaning out the mines in Gollund.