You can don only armor with which you have proficiency. To don armor, you must include it into your overall body about the system of one hour, through which you continue to be in contact with the armor. To doff armor, you should invest one hour eliminating it. It is possible to rest when donning

Mastermind – Mastermind provides a great deal of infiltration and mimicry abilities, allowing for them to almost flawlessly go themselves off as another person and discover details that other characters couldn’t. 

When you attain an Ability Score Increase, mak