The .pkg file adds your mod to the checkboxes you can select/deselect when posting a challenge to let the system know what expansion/mod content is included. Observe:
As you can see, I have the FedElite, Nomads,Order, Outcasts, Parasites, Swarm and Tribe expansions (official Positech content) as well as my own Antares Expanse, The Enemy, Matmos Rift and Great Powers Stations mods and darkstar’s phenomenal Uni-T Mod.
Theoretically, this prevents players from downloading a challenge with content they don’t have and crashing the game. (In practice, lots of players neglect to uncheck the various boxes, resulting in a challenge labeled with extra content it doesn’t have. But that’s neither here nor there.)
Oh, I wouldn’t give up that quickly. There are plenty of ways to make an ultimate apocalyptic death dealing device. There are plenty of mods that have em.
You just need to know which rules you have to abide, which ones can bent and what ones can be broken
The fleet were all equipped with dooms day devices - an entire Uni-T fleet was taken down by a single wing of federation fighters. . .
Mind you it was rather beautiful to watch the chain reaction wash across the formation. . .