Gooie Kablooie

The Gooie Kablooie is a weapon aimed at a whole enemy planet, not at one baron. Your planet can only have one at a time.

Nobody buys the weapon alone. One baron starts the work and names the target planet. The Queen Royale may pay part of it from her own purse. After that, any baron here can put money in, a million gold at a time. The price depends on the size of the target planet: aiming at a planet much larger than yours costs more.

When the last of the money is in, the weapon builds for three more days and then launches itself. Nobody decides that. The only person who can call it off is your elected Coordinator, and only before it leaves the ground. The gold is spent either way.

Being on the receiving end

A weapon that reaches your planet stays there and destroys regions each day. The day it lands it takes a tenth of every realm's regions. Every day after that it takes another twentieth, until five days are up and it burns itself out. Left alone it will cost you more than a quarter of your regions.

Only jets can reach it. Your realm is asked at the start of your turn whether you want to attack it. About a third of the jets you send do not come home.

No single wave can destroy it. It takes jets from many realms on the planet.

An SDI program is no help against it. Only your jets are.