Engines/Supplies/Magazines

[Krsqk]

SJ: If attack ships cost loads more, what benefits have you given for attacking? Attack fleet size is limited by cost/maintenance, and losing attack ships hurts a lot more than losing defense ships. If attacking has no benefits, then "turtling" could become the strategy of choice.

Or are you just trying to limit massive multi-system conquests, making smaller individual battles more important?