Fighter subclass
Cavalier
Mounted and defensive control focused on marking and holding enemies.
Cavalier starts by changing the normal Fighter play pattern through Bonus Proficiency; Born to the Saddle; Unwavering Mark, giving the subclass its first clear mechanical identity.
Later features such as Warding Maneuver, Hold the Line, Ferocious Charger expand that identity at higher levels, so the subclass has a clearer role in combat, exploration, utility, or support.
Bonus Proficiency; Born to the Saddle; Unwavering Mark
3rd level
Gain a skill or language, become highly capable while mounted, and mark enemies so they are punished for attacking others.
Warding Maneuver
7th level
Use a reaction 
D&D Portal - Reaction Action rule Reaction is an action economy rule used to
describe what a creature can do on its turn. Full link: https://dnd-portal.com/rules/actions/reaction/ and a die roll to increase the Armor Class 
D&D Portal - Armor Class Combat rule Armor Class is a combat rule used by attacks,
damage, defenses, or turn order. Full link: https://dnd-portal.com/rules/combat/armor-class/ of yourself or a nearby creature against one attack.
Hold the Line
10th level
Make opportunity attacks when creatures move within your reach and stop their movement on a hit.
Ferocious Charger
15th level
After moving before a hit, force 
D&D Portal - Force Damage type Force is a damage type used by attacks,
spells, class features, resistance, immunity, and vulnerability. Full link: https://dnd-portal.com/rules/damage-types/force/ the target to save or fall prone 
D&D Portal - Prone Condition Prone is a game condition that can affect
what a creature can perceive, do, or resist during play. Full link: https://dnd-portal.com/rules/conditions/prone/.
Vigilant Defender
18th level
Gain a special reaction D&D Portal - Reaction Action rule Reaction is an action economy rule used to
describe what a creature can do on its turn. Full link: https://dnd-portal.com/rules/actions/reaction/ on every creature’s turn for opportunity attacks.
FAQ
What is the Cavalier subclass?
Cavalier is a specialised subclass option that builds on the features and progression of its parent class.
Read more: Cavalier 
D&D Portal - Cavalier Fighter subclass Mounted and defensive control focused on marking and holding enemies. Full link: https://dnd-portal.com/classes/fighter/cavalier/
How does the Cavalier subclass work?
The Cavalier subclass changes the character’s play style through its own feature progression.
Read more: Cavalier D&D Portal - Cavalier Fighter subclass Mounted and defensive control focused on marking and holding enemies. Full link: https://dnd-portal.com/classes/fighter/cavalier/
What features does a Cavalier get?
The subclass page lists the features gained by a Cavalier and explains their effects.
Read more: Cavalier D&D Portal - Cavalier Fighter subclass Mounted and defensive control focused on marking and holding enemies. Full link: https://dnd-portal.com/classes/fighter/cavalier/
Is Cavalier a good subclass?
Whether Cavalier is a good choice depends on the role, abilities, and play style you want for the character.
Read more: Cavalier D&D Portal - Cavalier Fighter subclass Mounted and defensive control focused on marking and holding enemies. Full link: https://dnd-portal.com/classes/fighter/cavalier/
How do you play a Cavalier?
Use the subclass features to specialise the normal class play pattern and support the role you chose.
Read more: Cavalier D&D Portal - Cavalier Fighter subclass Mounted and defensive control focused on marking and holding enemies. Full link: https://dnd-portal.com/classes/fighter/cavalier/