Sorry if this has been asked before - search isn't working for me and my Google-fu is weak.
What's the best subsystem added in a supplement? EotE/AoR/FaD. I know "all the books are good", et cetera. But I was flipping through Forged in Battle and I saw the "Battle Scars" system, and I thought "****, that's cool."
Forgetting talent trees and specializations and such. What supplements are the best with regards to the systems they add?
Thanks in advance!