Aberrant Physiology. The knight doesn't need to breathe or sleep, and has advantage on saving throws against being poisoned

Eldritch Blood. Whenever the knight takes slashing, piercing or fire damage, each creature within a radius of 10 feet of it must succeed a DC 16 Dexterity saving throw, or take 7 (2d6) acid damage.

Disperse Thoughts. When a non-aberrant creature is taking a dodge action, a ready action, a help or chooses to [Tooltip Not Found] or is concentrating on it within 10 feet of the knight, the creature must succeed a DC 13 Wisdom saving throw. On a fail, any of the mentioned actions taken are cancelled and the concentration is broken. The DC increases by 1 for each allied aberrant creature within 10 feet of the knight. Only one saving throw is required per group of knights.

Multiattack. The kinght makes three attacks of any available combination. 

Scythe. Melee Weapon Attack: +8 to hit, reach 5 ft., one target. Hit: 16 (2d10+5) slashing damage, or 18 (1d12+5) slashing damage if used with two hands.

Numbing Strike. Melee Weapon Attack: +5 to hit, reach 5 ft., one target. Hit: 7 (1d6+4) bludgeoning damage plus 9 (2d8) psychic damage, and the target must succeed on a DC 15 Wisdom saving throw or be paralyzed until the end of the knight's next turn. The creature can repeat the saving throw at the beginning of it`s turn, ending the effect on a success.  

Parry. The abominable knight adds 2 to it's AC against one melee attack. To do so, the knight must be seeing the attack and be wielding a melee weapon.