Riode also contains a World boss called Yilllis whose deadly water splash damage attacks will wipe unprepared groups in mere seconds. The zone should also house Zygniv, a terrible demon that made a short appearance in CBT (you can see all the goodies he dropped in CBT on this Zygniv page).
Watch the Riode zone video preview to get a better feel for what awaits as Open Beta draws ever closer.