C9 players will need to battle through multiple levels of the Guardian's Tower in order to find Tertis' Heart and save Glenheim from destruction. The Tower boasts 20 levels and three major dungeons. Webzen also says that it is increasing the level cap to 65 and adding a new class of epic items "which have the potential to overpower other items in the game." You can watch a preview of the expansion via the video that we've embedded after the cut.
[Source: Webzen press release]