Expert
Prerequisite
Skilled in the chosen weapon, Intelligence 14 or higher
Unlike most feats, this one is purchased with an investment of downtime and money. The cost of this feat is 4 weeks of time and 2,000 GP. In addition to the prerequisite cost of 2 weeks of time and 500 GP.
This skill level grants enhanced skill in the use of a specific weapon. It allows the character to utilize greater damage and attack capacities. In your hands the chosen weapon is more accurate and lethal than typical and other weapons you wield.
You add two to attack rolls with the chosen weapon.
You increase the chosen weapon's number of damage dice (from the base weapon) by one and then add 2 to the roll.
If your chosen weapon is a melee weapon, you increase your AC by 1 while the chosen weapon is being wielded. If your chosen weapon is a ranged weapon, increase it's range by 25%.
Starting at this level of training you start gaining a set of abilities that are fueled by special dice called superiority dice. You have two superiority die, if you have this feature the die is an additional two dice otherwise it is d4. A superiority die is expended when you use it. You regain all of your expended superiority dice when you finish a short or long rest. You can use only one maneuver per attack.
By expending a superiority die while wielding the chosen weapon, you may any of the below actions:
You may take the dodge action as a bonus action.</text>
Disarming Attack. When you hit a creature with a weapon attack, you can expend one superiority die to attempt to disarm the target, forcing it to drop one item of your choice that it's holding, You add the superiority die to the attack's damage roll, and the target must make a Strength saving throw, On a failed save, it drops the object you choose, The object lands at its feet.
This feat replaces it's prerequisite feat.
Source: Master Player's Book, page 15.