I am looking for a Sci-Fi combat system that is versatile and reasonably fast-paced. I'd like it to be as streamlined as possible, but won't be to scared by complexity if it's well justified.
I ran a Call-of-Cthulhu based (hard-ish) sci-fi adventure. I like percentile dice and tension that comes with low power. However I also wanted combat-heavy setting (all players were space marines, similar to those from Aliens universe), so I gave them a lot of tactical options, like different armor, optical camouflage, UV goggles, medkits, insta-heal (gives 50% penalty to all skills) etc. to boost survivability.
I focused more on good tactical decisions than luck.
Obviously CoC is not very combat oriented system so I did a lot of modifying it and making my own rules to account for
- non-lethal damage (for example when armour absorbs damage, it still translates to fatigue)
- body-part specific damage
- different effects of work equipment (i.e. helmets remove peripheral vision...)
- implants (modifying stats)
- stimpacks (temporary boost of stats)
- penalties on all stats depending on overall physical condition of a player
Obviously, adding all of this sometimes slowed down the pacing of combat, and some calculations were difficult to make (having stims bonus and low health penalty at the same time, then accounting for other battlefield conditions). But I liked the "realism" very much.
I'd like to find a system that has as many of these options already included with simple rules, and where making a mistake is unforgiving (i.e. NOT D&D like). I do not expect to find all of this in one system, I'd be willing to sacrifice some of the realism for simplicity, or at least to find a system that is easier to modify to my preferences than base CoC.