Adding the commer Class

[jbearwillis]

How would I begin to script this ability? Totally lost on this one.

A Proficiency

At first level, and again at 7th, 11th, 15th and 19th level you chooses any one skill, tool, instrument, kit, vehicle, gaming set, saving throw, armor or weapon you are not proficient with. You cannot choose heavy armor unless you are proficient with medium armor, and you cannot choose medium armor unless you are proficient with light armor. You are now proficient with your choice.