I don't know whether to call this a bug or not, but I discovered something funny while playing as the Drengin. As you know they can get a huge pile of Super Dominator Corvettes, and I had about 50 of them in the middle of one game (at this point they were just cannon-fodder). What is so special about that? Nothin
Ok, so I bring up the Torian's diplomacy screen (tech trading is off) I have about 8 planets, they have 6.
Drengin: I would like to trade 50 useless Super Dominator Corvettes for all your planets
Torians: OK!
Torians gone. Lol.
It worked on everyone else too. I guess I won a trade victory.