Readied strike

If you are not holding an item or mounted, you may expend half of your movement and enter a stance of readiness  doing the following:

• Focused footwork:  You cannot move and may only perform bonus actions, attacks and make attacks of oppurtinity.
• Sharp reflexes: Any creature moving to a space in your reach or targeting you with a melee attack provokes an attack of opportunity.
• Striking draw: You can draw a stowed one-handed melee weapon as part of any attack you make, on a hit dealing an additional weapon damage dice.

The state of readiness ends after you make an attack, if you pick up an item and can be ended willingly at any time.