Bretonnian Knight of the Realm - Crusader

Mounted Combatant. The knight has the Mounted Combatant feat. While mounted, it has advantage on melee attack rolls against creatures smaller than its mount, can cause attacks that would target its mount to hit it instead, and their mount takes no damage on a successful Dexterity saving throw against an effect that deals half damage on a fail, and half damage on a failed save.

Desert Crusader. The knight and its mount ignore difficult terrain caused by sand, are acclimated to extreme heat, and require only half the normal amount of water per day.

Knightly Vow. The knight have advantage on saving throws against being frightened.

Weapon Mastery. Lance (Topple): On a hit, the target must succeed on a DC 15 Strength saving throw or be knocked prone.  Longsword (Sap): On a hit, the target has disadvantage on its next weapon attack before the end of its next turn.

Jousting Expertise (Recharge 5–6). If the knight's mount takes the Dash action and moves at least 20 feet straight toward a target, and the knight hits that target with a lance attack: the attack deals double the normal damage dice (4d8 instead of 2d8); the target must succeed on a DC 16 Strength saving throw or be knocked off their mount and fall prone; if the attack is a critical hit, the lance shatters and is no longer usable.

Multiattack. The knight makes two melee attacks with its longsword. If it makes two melee weapon attacks (not using a lance), it can also use Shield Bash.

Lance (Mounted Only). Melee Weapon Attack: +7 to hit, reach 10 ft., one target.
Hit: 2d8 + 4 piercing damage. (Mastery: Topple)

Longsword. Melee Weapon Attack: +7 to hit, reach 5 ft., one target.
Hit: 1d10 + 4 slashing damage. (Mastery: Sap – Versatile 1d10)

Shield Bash. Melee Weapon Attack: +7 to hit, reach 5 ft., one target.
Hit: 1d4 + 3 bludgeoning damage.
The target must succeed on a DC 13 Strength saving throw or be knocked prone.