Battle Master

Third level Fighters exhibit martial training that allows them to perform special combat maneuvers. You gain the following benefits:

• You learn a number of maneuvers equal to your Fighter level/3 + your Strength or Dexterity modifier of your choice from among those available to the Battle Master archetype in the fighter class. If a maneuver you use requires your target to make a saving throw to resist the maneuver's effects, the saving throw DC equals 8 + your proficiency bonus + your Strength or Dexterity modifier (your choice). You may swap out your maneuvers known after a long rest
• You gain 4 superiority die at level 3 with a die size of d8. You gain additional die and die size at higher levels: 6 d10's at Fighter level 10 and 8 d12's at Fighter level 18.  A superiority die is expended when you use it. You regain your expended superiority dice when you finish a short or long rest.