Unarmored Strength

You have trained your body and mind through intense training you have boasted the size and strength of your muscles to a great extent and have become used to fighting without armor. 

• Add your str modifier as well as 2x your dex modifier to your existing AC. This feat will not function if wearing armor. it will function if you are using a shield, bracers or buckler shields.
• Your character is treated as another size category larger do to your muscles having become much larger. This includes any bonuses such as reach, increase in strength, increase in carrying capacity, etc. that would be associated with that size category. However the penalty's of that size category would also apply such as taking minus's on checks such as stealth etc.
• Your strength and size become a unyielding force and you become unable to be restrained or held in place by anything other than a hold person spell. You have advantage on dice rolls to destroy objects such as a boulder, siege weapon or wall and to break restraints on others such as rope, iron bars or chains. However if the object you wish to destroy has magical resistance to damage, then there is no advantage on dice rolls since strength alone may not be enough to break a magical object. Unless you have been buffed with an ability or spell to make it easier to break the object in question. Then the advantage to the dice roll to break an object that is magical may still apply, but how much of an advantage if any for breaking a magical object would be at the DM's discretion.