The Jedi have A Certain Discipline That Enables them with Practice To Change there Appearance and Thus There Ability for a Certain Time and Situation, Depending On The Strength Of The User. The First Jedi, to Introduce This Discipline was, Jocasta Nu, She Was a Jedi Temple Master and On The Council. The Upcoming Conflict with the Last Order is Making These students Scour these old books, looking for anything to give them an Upper Hand in the Upcoming Imminent Conflict.