You want to know the reason the shivans did not send a massive sath fleet in FS 1? They wern't the same damn shivans, or at least it makes the most sense: The Ross 128 Shivans and the Nebula shivans are two branches of the same species that got seperated thousands of years ago, sharing similarities in only the weakest of craft. The Scorpion, Shaitan, Lucifer, and Trident belong to the less advanced branch, the Cain, Lilith, Demon, Nehema (Must be, due to the HoL developing the Sekhmet), Dragon, Manticore, Nephilim, Seraphim, Basilisk, Azrael, Mephisto, Asmodeus Being relitively old developements before the shivans split off from each other, and beam tech and newer ships belonging to the larger more powerful branch...