Blood Fiend

Abnormal Swiftness. This Creature does not Incur Opportunity attacks.

Strong Legs. The Blood Fiend can jump its entire movement with or without a running start.

Other Worldly Constitution. The Blood Fiend has advantage on saving throws against magical effects.   

Legendary Resistance (3/Day). If The Blood Fiend fails a saving throw, he can choose to succeed instead.

Multiattack. The blood Fiend makes two Claw Attacks and one Bite attack.

Claw. Melee Weapon Attack: +12 to hit, reach 10 ft., 1 target. Hit: 21 (3d8 + 7) slashing damage. 

Bite. Melee Weapon Attack: +12 to hit, reach 5 ft., # target. Hit: 33 (4d12 + 7) piercing damage.

Draining Bite (Recharge 5-6). The Blood Fiend makes an attack against one creature it can see within 5 ft, this creature must succeed on a DC 19 Constitution save. Taking (8d10) Necrotic damage on a failed save or half as much on a success. The Blood Fiend heals for half the damage inflicted.

Leach. If The Blood Fiend sees a creature regain regain hit points within 20 ft. the The Blood Fiend can use its reaction to receive these hit points instead.

Dash (Costs 1 Actions). The Blood Fiend Moves up to its full movement.

Blood Curdling Screech (Costs 2 Actions). Each creature that the Blood Fiend chooses within 30 ft of it must succeed on a DC 18 Wisdom save or become frightened for frightened for 1 minute. An affected creature can remake the save at the end of each of its turns, ending the effect on a successful save. 

Boiling Blood (Costs 3 Actions). Every Creature within a 20 ft radius of a point the Blood Fiend can see within 90 ft must succeed on a DC 18 Dexterity save or take 8d6 Fire damage on a failed and half as much on a successful save.