Cambion Assassin

Assassinate. During its first turn, the cambion assassin has advantage on attack rolls against any creature that hasn't taken a turn. Any hit the cambion assassin scores against a surprised creature is a critical hit.

Evasion. If the cambion assassin is subjected to an effect that allows it to make a Dexterity saving throw to take only half damage, the assassin instead takes no damage if it succeeds on the saving throw, and only half damage if it fails.

Fiendish Blessing. The AC of the cambion assassin includes its Charisma bonus.

Fiendish Weapons. The cambion assassin's weapon attacks are magical and deal an extra 10 (3d6) acid damage on a hit (included in the attacks).

Innate Spellcasting. The cambion assassin’s spellcasting ability is Charisma (spell save DC 15). The cambion can innately cast the following spells, requiring no material components:

3/day each: alter self, command, detect magic

1/day: plane shift (self only)

Sneak Attack. Once per turn, the cambion assassin deals an extra 28(8d6) damage when it hits a target with a weapon attack and has advantage on the attack roll, or when the target is within 5 feet of an ally of the cambion assassin that isn't incapacitated and the cambion assassin doesn't have disadvantage on the attack roll.

Multiattack. The cambion assassin makes two shortsword attacks or two shortbow attacks.

Shortsword. Melee Weapon Attack: +9 to hit, reach 5 ft., one target. Hit: 8 (1d6 + 5) piercing damage, plus 10 (3d6) acid damage.

Shortbow Ranged Weapon Attack: +9 to hit, range 80/320 ft., one target. Hit: 8 (1d6 + 5) piercing damage, plus 10 (3d6) acid damage.

Fiendish Charm. One humanoid the cambion assassin can see within 30 feet of it must succeed on a DC 15 Wisdom saving throw or be magically charmed for 1 day. The charmed target obeys the cambion assassin’s spoken commands. If the target suffers any harm from the cambion assassin or another creature or receives a suicidal command from the cambion assassin, the target can repeat the saving throw, ending the effect on itself on a success. If a target’s saving throw is successful, or if the effect ends for it, the creature is immune to the cambion assassin’s Fiendish Charm for the next 24 hours.