The normal evil races are not bad but I think that they are too similar to player´s race. There should be a ( or many )REALY evil race that maybe comes through special black/wormwholes. They would have strong weapons a little bit like the role of dreadlords but different. That when you drive through these wormholse you get into a part of universe which cant be reached at normal ways. They would have very good planets ( class 20 up ) with very rare resourcces like 700 percent precursor fields therefore their military would be very very strong ( maybe 50 damage in all categories and in a fleet a maximum of 200 damage or so). Taking their planets would be very hard too. That you need 20000 soldiers to have a chance ( because you don`t want to damage this great planet with gas or worse). This extra universe should be maybe parallel to the normal so that you could reach it with an special button for parallel universes like in early Earth (the Game) titles where you can swith between underworld and the normal world but in galciv2 the diffrent parts should be the same. Maybe this evil race wormhole should be activatet permanent and that these bad guys only start come out there when somebody comes in. Ther could be a little guard of guys who are in there that you no what awaits you. This whole princip could be made with a good race in a wormhole galaxy which can defend you against evil races or that they trade with you through the wormhole. Or that nobody is there and you can expand how you like in there. Performence would decrease I think but you could make an option how big an parallel galaxy can be and so on. So a also pc`s which are not so good could have this feauture too ( If you will do it, of course)