well i guess the rise of DragonFall map should be like the rising of Orr a event that will create tidal waves and another "environmental signs" like a exodus of species to other areas of Tyria. Theres a room there for a lot of stuff like the DragonFall be the blow that would wake the deep sea dragon.
-- Atlantean Sword --
The secret of steel has always carried with it a mystery. You must learn its riddle, Conan. You must learn its discipline. For no one - no one in this world can you trust. Not men, not women, not beasts..." [Points to sword] "This you can trust."