For me, it’s the retribution field. Simple concept: a force field that absorbs the kinetic energy of incoming projectiles, then releases that energy back at the attacker in an Imma firin mah lazer style blast of concussive force.

It’s silly because I’ve already established that the yinrih can flout Newton’s laws of motion and have access to things like micro fusion reactors that could theoretically generate the energy on its own without having to absorb it externally. At one point I had a weak justification based on Claravian just war doctrine, a quantitatively literal version of the Lex Talionis where you could only use the exact same force as was used against you, but I dropped that in short order and now it’s just there because of the rule of cool.