Like how Drang and Strum work together, some lesser exotic armor could use that treatment. . Nezarec’s Sin could use help, like maybe another armor piece would increase the duration of the abyssal effect after every void based kill. . Or the ACD Feedback Fence could use another armor piece to allow you to recover 1 charge every 10 seconds for your shockwave when hit. . Even the Knucklehead Radar could have an additional armor piece to allow very specific enemy radar detection whe very close (like Halo red dot specific on radar).