I haven’t finished the game so I don’t know if something was done, but…
Whatever happened to the weapon that the moles developed (the weapon that amplified Jormag’s roar)? It not only was extremely destructive but also summoned a crapload of Jormag’s corrupted minions.
Now, what if you took that to fight Zaitan and the other dragons? It’s well known that the dragons’ minions fight each other. Can’t we make replicates of the weapon with different roars and start shooting them in other dragons’ territories? It’s not really a solution, but it seems like something the Order of Whispers would be very interested in. If you keep getting certain dragon minions killed, I would assume it would be that much easier to reach the dragon.