Blood-Starved Beast

Bloodlust. As the blood-starved beast begins to taste its own blood, it will enter into a greater frenzy, becoming stronger and faster. When the blood-starved beast is reduced to 2/3 of its maximum health, it can move an additional 10 feet per round, and make one additional claw attack.

Poison Aura. When the blood-starved beast is reduced to 1/3 of its maximum hitpoints, it will begin releasing a poisonous mist around it. Any creature that begins its turn within 5 feet or ends its turn within 5 feet of the blood-starved beast must make a DC 13 Constitution saving throw or take 2d6 poison damage and be poisoned. A poisoned creature can make a second Constitution saving throw on the beginning of their next turn. On a failed save, the poisoned creature takes 1d6 poison damage per round for 1 minute. A creature that is currently poisoned cannot be poisoned again.

Poison-tipped Claws. When a target is hit by the blood-starved beast, it must succeed a DC 10 Constitution saving throw or be poisoned. A poisoned creature can make a second Constitution saving throw on the beginning of their next turn. On a failed save, the poisoned creature takes 1d6 poison damage per round for 1 minute. A creature that is currently poisoned cannot be poisoned again.

Multiattack. The blood-starved beast makes two attacks with its claws.

Claw. Melee Weapon Attack: +6to hit, reach 10 ft., Hit: 10 (2d6 + 3) slashing damage. 

Feral Lunge. The blood-starved beast ravenously lunges at a target within 30 feet, landing in any open space next to it. The target must succeed a DC 15 Dexterity saving throw or take 17 (4d6 + 3) slashing damage.