Cross Training (Ability Score Improvement)

You have trained with a master in a technique, or was imparted some power, from another archetype of your class. You may choose one subclass ability of a class you are trained in that is different from the subclass you chose. To pick which ability you must be meet the level requirements for that ability. To pick this feat you must spend time in game learning the ability. In addition increase one ability score of your choice to a maximum of 20.