Black Half-Dragon Knight

Fearless. The Black Half-Dragon Knight is immune to being frightened

Spellcasting. The Black Half-Dragon Knight is an 10th-level spellcaster. Its spellcasting ability is Charisma (spell save DC 13, +5 to hit with spell attacks). It has the following paladin spells prepared:

1st level (4 slots): command, compelled duel, hellish rebuke, wrathful smite

2nd level (3 slots): branding smite, crown of madness, darkness

3rd level (2 slots): blinding smite, dispel magic

Multiattack. The Black Half-Dragon Knight makes two attacks with its Dark Flame Tongue longsword.

Dark Flame Tongue. Melee Weapon Attack: +7 to hit, reach 5 ft., one target. Hit: 8 (1d8 + 4) slashing damage.  If activated, Dark Flame Tongue will also deal 1d6 fire damage and 1d6 necrotic damage.

Shield Bash. Melee Weapon Attack: +7 to hit, reach 5 ft., one creature. Hit: 9 (2d4 + 4) bludgeoning damage. If the target is a Medium or smaller creature, it must succeed on a DC 15 Strength saving throw or be knocked prone

Dark Flame Tongue. The Black Half-Dragon Knight can use a bonus action to speak this magic sword's command word, causing purple flames to erupt from the blade. These flames shed bright light in a 40-foot radius and dim light for an additional 40 feet. While the sword is ablaze, it deals an extra 1d6 fire damage and 1d6 necrotic damage to any target it hits.

Parry. The Black Half-Dragon Knight adds 3 to its AC against one melee attack that would hit it. To do so, the Black Half-Dragon Knight must see the attacker and be wielding a melee weapon.