The Rift of Oblivion sends players back in time to witness the destruction of the Tower of Eternity, while Kruban Base pits players against enemies scavenging for the ruins of the tower. The Garden of Knowledge also spins off of the tower, the Balaur Marching Route pits you against the enemy faction while gathering machine parts, while the Ashunatal Dredgion also pits you up against the enemy faction in a deadly region. Last but not least, the Runatorium is a straightforward treasure hunt, something players will no doubt welcome when patch 5.1 arrives.
Source: Official Site