Battle Master Fighter

Feature Description
Combat Superiority You learn maneuvers fueled by superiority dice (d8). You begin with 4 superiority dice and gain more at higher levels. You can choose maneuvers to enhance your attacks and gain additional maneuvers at certain levels. Maneuver save DC is based on your proficiency bonus and Strength/Dex modifier.
Student of War At 3rd level, you gain proficiency with one type of artisan's tools of your choice.
Know Your Enemy At 7th level, you can learn about a creature’s capabilities by spending 1 minute observing or interacting with them outside combat. The DM tells you whether the creature is your equal, superior, or inferior in certain characteristics like Strength, Constitution, Armor Class, or Hit Points.
Improved Combat Superiority At 10th level, your superiority dice become d10s. At 18th level, they become d12s.
Relentless At 15th level, if you roll initiative and have no superiority dice left, you regain 1 superiority die.