Voidborne Champion

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

Charge. If the voidborne champion moves 20 feet towards a creature before making an attack, the attack deals an additional 7 (2d6) damage of the weapons damage type.

Brutal Critical. If the voidborne champion scores a critical hit, the deal an additional 14 (4d6) damage of the weapons damage type.

Born of Nothing. When a voidborne creature is reduced to 0 hit points, it must make a DC 15 Charisma saving throw. On a success, it regains all of its hit points and the DC for this feature increases by 5.

Multiattack. The voidborne champion makes five zweihander attacks.

Zweihander. Melee Weapon Attack: +11 to hit, reach 5 ft., one target. Hit: 12 (2d6 + 5) slashing damage plus 9 (2d8) necrotic damage. Additionally, creatures of the champion's choice within 30 ft. of the target take 9 (2d8) cold damage. 

Step of the Void. The voidborne champion teleports to an unoccupied space within 30 ft. of it.

Parry. The voidborne champion adds 6 to its AC against one melee attack that would hit it. To do so, the voidborne knight must see the attacker and be wielding a melee weapon. If this increase causes the attack to miss, they can make one melee weapon attack against the attacker.