One Arm
From NsdWiki
Expoint Bonus: 4
You are missing one arm. The GM is the arbiter of any penalties this might entail, but most likely you will take a −4 penalty to Climb, Grab, Disable, Disguise, and Gymnastics. You will also have a terrible time carrying comrades, large loads, etc.
Note that you can also take Missing Hand, but for the arm you still have.
Incompatible with
Unremarkable (unless a realistic replacement is worn) and Unarmed