Black Dragon Descendant

Amphibious. The descendant can breathe air and water.

Dragon Descendant. The descendant has advantage on saving throws against actions made by black dragons.

Draconic Fear Immunity. The descendant is immune to being frightened by dragons, dragonborn, and other draconic creatures.

Magic Resistance. The descendant has advantage on saving throws against spells and other magical effects.

Multiattack. The descendant makes two attacks.

Longsword. Melee Weapon Attack: +7 to hit, reach 5 ft., one target. Hit: 7 (1d8 + 7) slashing damage, or 12 (1d10 + 7) slashing damage if used with two hands.

Heavy Crossbow. Ranged Weapon Attack: +5 to hit, range 100/400 ft., one target. Hit: 7 (1d10 + 2) piercing damage.

Draconic Cry (3/day). The descendant lets out a cry at its enemies within 10 feet of it. Until the start of its next turn, the descendant and its allies have advantage on attack rolls against any of those enemies who could hear it.

Nimble Escape. The descendant can take the Disengage or Hide action as a bonus action on each of its turns.

Guided Strike (Rcharges after a Short or Long Rest). The descendant grants a +10 bonus to an attack roll made by itself or another creature within 30 feet of it. The descendant can make this choice after the roll is made but before it hits or misses.