Superiority Dice. You have four superiority dice, which are d8s. A superiority die is expended when you use it.
Saving Throws. Some of your maneuvers require your target to make a saving throw to resist the maneuver's effects. The saving throw DC is calculated as follows:
Maneuver save DC = 8 + your proficiency bonus + your Strength, Dexterity, or spellcasting ability modifier (your choice)
Pushing Attack
When you hit a creature with an attack, you can expend one superiority die to attempt to drive the target bak. You add the superiority die to the attack's damage roll, and if the target is large or smaller, it must make a strength saving throw. On a failed save you push the target up to 15 feet away from you.
Evasive Footwork
When you move, you can expend one superiority die, rolling the die and adding the number rolled to your AC until you stop moving.
Trip Attack
When you hit a creature with an attack, you can expend one superiority die to attempt to knock the target down. You add the superiority die to the attack's damage roll, and if the target is Large or smaller, it must make a Strength saving throw. On a failed save, you knock the target prone.
Precision Attack
When you make a weapon attack roll against a creature, you can expend one superiority die to add it to the roll. You can use this maneuver before or after making the attack roll, but before any effects of the attack are applied.
Riposte
When a creature misses you with a melee attack, you can use your reaction and expend one superiority die to make a melee weapon attack against the creature. If you hit, you add the superiority die to the attack's damage roll.