Of the official races, the craves have in my opinion the best synergies. So, I'm here to ask my fellow warmongers/backstabbers: what's your favorite war loving custom faction in Endless Space 2? I just tried to create my own custom faction, but I didn't realize that you can't use more than 8 traits in a custom faction. They actually declared war on me, after already wiping out a different faction and going to war with the fourth faction of the game. I'm usually the one who starts committing genocide but if the tutorial game is any indication, the AI is much more genocidal in this game. However, Endless Space 2 changes just enough that it throws my system into disarray.
In Civ V and the first Endless Space, I had my routine perfected to where I didn't really worry at all whether or not I'd win (in single player.
Whenever I play games like Civ or Endless Space, I tend to make my factions go for science so I can research the best technologies to expand, grab all the best resources, and start mass producing as many ships as possible so I can sink the world/Galaxy into a dark age of warfare.