Reforge

I'm going to go with trusting the magic advisor. They probably know more than we do on magical defense, and we certainly won't be able to fit every citizen into the World Bank.
That aside, we know that the brown one has (at least local) group teleportation available to them. It's quite possible that proximity doesn't matter as much as it should.

I like the sound of a Beastlands peace mission, but let's also take a quick trip to the Fire Nation. The Prism Beast is on their border; they are likely just as desperate as we are.

EDIT: Unless that red border was the Beastlands, and the Fire Nation is far away. Then let's not use OOC knowledge and not visit the Fire Nation.