What we tell the players

The pitch:
SciFi
ODST style land assaults with custom mechanics for ship-to-ship
Ootlantine invasion of Grellish space
The Guard and the Heroes
What is the basis of the game (This is not JUST combat)
make this sound exciting
An unknown fleet of starships appears at the edge of the Grellish Herds above a Breed Guard base. Drop pods fall to the surface, like nuts from a tree. An invading army emerges and the players must choose how to act. Can they stop these new creatures, will they even try? The ferocity of the army can be matched only by the heavily outnumbered Breed Guard that are defending the edge of Paux space.