So I have a theory.
The Malwish have so far in chapter 9, been changing to be more unified and more aggressive to the Northeners, mostly from Wax's POV but I digress, I wonder if these rather rapid political decisions might be because of another group like the Set, just set (heh) up in the Southern Continent by Trell.
After all Trell wouldn't be hindered by measly distance and would definitely want a way to influence the Malwish. And sure it might just be natural tensions rising, but I think that just as the Basin's politics are being influenced by the Set to go to war, so too are the Malwish.
What do you think?