The Mega Laser Station is a relatively low tech super weapon that can be built in the Cosmic Era
Ludicrous gats and more!
Just what it says on the tin
Also known as a Klein Field Generator, it is one of the few defensive technologies that can withstand high energy and gravitronic weaponry
An arcanotech weapon system, also known as an implosion bomb, a Schwartzchild, or a Corrosion Warhead
The PCs are sent with a diplomat to another country to protect him and do his bidding. There may be some espionage, rescuing, downright bullying, etc. Could make a nice medieval, special operations background.