Cavalier

Source: Xanathar's Guide to Everything (Revised for 2024)

Defend Allies on Horseback (Horse Optional)

The archetypal cavalier excels at mounted combat. Usually born among the nobility and raised at court, a cavalier is equally at home leading a cavalry charge or exchanging repartee at a state dinner. Cavaliers also learn how to guard those in their charge from harm, often serving as the protectors of their superiors and of the weak. Compelled to right wrongs or earn prestige, many of these fighters leave their lives of comfort to embark on glorious adventure.

Level 3: Cavalry Training

You are trained in mounted combat and the responsibilities that come with it.

Level 3: Unwavering Mark

You can menace your foes, foiling their attacks and punishing them for harming others.

Level 7: Warding Maneuver

You learn to fend off strikes directed at you, your mount, or other creatures nearby. If you or a creature you can see within 5 feet of you is hit by an attack, you can roll 1d8 as a reaction if you're wielding a melee weapon or a shield. Roll the die, and add the number rolled to the target's AC against that attack. If the attack still hits, the target has resistance against the attack's damage.

You can use this feature a number of times equal to your Constitution modifier (a minimum of once), and you regain all expended uses of it when you finish a long rest.

Level 10: Hold the Line

You become a master of locking down your enemies. Creatures provoke an opportunity attack from you when they move 5 feet or more while within your reach, and if you hit a creature with an opportunity attack, the target's speed is reduced to 0 until the end of the current turn.

Level 15: Ferocious Charger

You can run down your foes, whether you're mounted or not. If you move at least 10 feet in a straight line right before attacking a creature and you hit it with the attack, that target must succeed on a Strength saving throw (DC 8 + your proficiency bonus + your Strength modifier) or be knocked prone. You can use this feature only once on each of your turns.

Level 18: Vigilant Defender

You respond to danger with extraordinary vigilance. In combat, you get a special reaction that you can take once on every creature's turn, except your turn. You can use this special reaction only to make an opportunity attack, and you can't use it on the same turn that you take your normal reaction.