Basarab Radu

Indomitable (2/Day). The champion rerolls a failed saving throw.

Multiattack. The champion makes three Greatsword or Shortbow attacks.

 Basarab's Scimitar. Melee Weapon Attack: +9 to hit, reach 5 ft., one target. Hit: 12 (2d6 + 5) slashing damage, plus 7 (2d6) slashing damage if the champion has more than half of its total hit points remaining.

Basarab uses the Scimitar of sharpness

 When you attack a creature with this weapon and roll a 20 on the attack roll, that target takes an extra 14 slashing damage. Then roll another d20. If you roll a 20, you lop off one of the target's limbs, with the effect of such loss determined by the GM. If the creature has no limb to sever, you lop off a portion of its body instead.

Spellcasting.

At will: Eldritch Blast, pins & needles, howl, blood bolt

2/day each: greater invisibility, misty step, see invisibility, fly, locate object, black tentacles, silvery barbs

1/day: power word stun

Blood Bolt Cantrip.

You hurl a shard of crystallized blood from your body at a creature within range. Make a ranged spell attack against the target. On a hit, the target takes 1d8 piercing damage and must make a Constitution saving throw. On a failed save, it can’t take reactions until the start of its next turn. 

Blood Magic. When you cast this spell, you can choose to deal 1 damage to yourself, this damage ignores resistances and immunities. When you do this, add your Constitution modifier to the damage dealt. At Higher Levels. This spell’s damage increases by 1d8 when you reach 5th level (2d8), 11th level (3d8), and 17th level (4d8).

Second Wind (Recharges after a Short or Long Rest). The champion regains 20 hit points.

Unbridled Fury. In response to being hit by a melee attack, the tanarukk can make one Bite or Greatsword attack with advantage against the attacker.