I guess there is something not entirely logical about all of the empires going on a wild goose chase for a bunch of assassins, psychics or not.
The doomsday weapon isn't such a bad idea together with the Equinox terrorist group.
Btw: What is are the currencies used in the empires? Do they all use the same or is it different for each one?
(Or do they trade doomsday weapons for 2 peanuts and a bar of chocolate in the new age?)