Quote Originally Posted by Lium View Post
That's a very good point, actually. Sometimes I forget Calamities take a lot of work and planning to cause. They can take centuries or even millennia to plan. It isn't just destruction, but a specific kind of destruction. It has to be an aspect of aether, such as light, dark, earth, water, ice, fire, etc. And then there has to be the corresponding catastrophe on a Shard that matches the imbalanced aether on the Source.

Koryu certainly has the destruction part down pat. I'm guessing his aspect would be fire? But the Ascians would have to make sure that same aspect was overflowing from a Shard. Still, though, I'm sure they could have figured something out. Unless Koryu was too unpredictable, even for the Ascians.
Presumably they would need the world destruction to stop at some point. If all life in the Source is destroyed, then the Rejoining has failed.