In 2192, a horde of “barbarians” have smashed the approaches to the rich industrial Sol system! This barbarian fleet of FTL-capable ships slowly consumed the best worlds from the technologically advanced peoples. Despite desperate defenses the horde defeated all who stood in there way, darkening skies with their legion of invasion barges.
Finally, a battle-tested fleet has gathered at Sol. Here, the line is drawn. Here the United Defense Command (UDC) promises to break the invasion or die trying. There is no retreat! Victory or death!
The barbarian player has a large pool of resources to build the invasion force (IFOR). The barbarians are barely capable of FTL travel and their ships are rudimentary. What they lack in technological prowess they make up for with numbers. Essentially, the IFOR is made up of ships out of the Triplanetary rules booklet.
UDC ships are the last, best hope for the technologically advanced worlds coreward. They are capable of multi-fuel burns (borrowing from the “wear” concept), and are considered “torch” ships (they do not have to refuel, but they DO have to resupply). They are also very expensive. UDC gets one orbital fortress for free (probably in orbit above Terra).
The barbarian player can approach from any vector, using the FTL rules in “Endgame”. The UDC player may elect a vector as “coreward”, and that cannot be used for barbarian arrival. The UDC player then places its units as desired.
IFOR’s goal is to take as many worlds as possible by landing their invasion barges (use a liner or packet). Each invasion barge that lands deposits a ground unit. I’m going to have to have a very simple ground combat resolution system. Ships in orbit can suppress hex sides and enemy units, but cannot destroy those units. Besieged UDC units can hold out, but not forever. If enough units are landed, the fight will be brutal, but the outcome all but certain. UDC player may have options for purchasing ground units, but I’m not sure yet.
Terra is worth more points than, say, Mars. If IFOR takes Terra, that is a huge loss for the UDC. The UDC player must inflict enough damage to prevent this, but cannot afford to lose the fleet in the process.
Also, the IFOR will not use nuclear weapons on the planets they intend to invade. They will use them on extra-terrestrial targets, however.