Actions

Multiattack: The Dragon Born Captain attacks with Chain whip and Short sword when it takes the attack action. One of these attacks can be replaced by Acid Stream.   Chain whip: +9 to hit, 15ft reach, 16(2d10+5) slashing. If a creature wearing armor that is struck by this weapon, their armor is damaged and gives their AC a cumulative -1, -5 armor has been destroyed and is unrepairable. A creature not wearing armor takes an additional 9(2d8) acid damage from this weapon.   Short sword: +9 to hit, 5ft reach, 8(1d6+5) piercing, DC 15 con save for half against 28(8d6) poison damage.   Acid Stream: The Dragon Born Captain spews a stream of acid from his mouth. 30ft line, DC 15 Dex save for half against 36(8d8) acid. Creates puddles of acid that damage creatures that. The first time a creature moves into a space with an acid puddle, or starts their turn in an acid puddle, they must roll a DC 15 Con save or take 18(4d8) acid damage and have their movement reduced to 0 until the start of their next turn. On a successful save they take half damage and suffer no penalty to their movement.   Tangle Whip: As a bonus action, he can grapple(Escape DC 17) a creature when it is hit with Chain Whip. With a creature grappled this way, he has advantage on chain whip attacks against them and can drag them 5ft toward him as part of that attack.

Reactions

Body shield: If the Dragon Born Captain fails a saving throw that will result in him taking damage, he can instead use his reaction to force one of his minions within 5ft to take that damage instead.   For example: The captain and a goblin are standing next to each other when a wizard casts fireball(28 fire damage) on them. The Captain fails his saving throw(28 fire), and the goblin succeeds(14 fire). The Captain then uses the goblin as a body shield to protect himself from the damage. This means the goblin takes 42 fire damage and the captain takes none.