Cocaine Bear

Keen Smell. The bear has advantage on Wisdom (Perception) checks that rely on smell.

Multiattack. The bear makes two attacks: one with its bite and one with its claws. Can also use breath weapon if it is available.

Bite. Melee Weapon Attack: +12 to hit, reach 5 ft., one target. Hit: 9 (3d8 + 8) piercing damage.

Claws. Melee Weapon Attack: +12 to hit, reach 5 ft., one target. Hit: 12 (4d6 + 8) slashing damage.

Breath Weapon(recharge on 5-6): 15 ft cone poison vomit, CON Save DC16 8d6 and become poisoned for 1 hour

Trample: the bear can use its bonus action after moving at least 15 feet to trample any creatures who are in its path, the creatures are shoved out of the way and must make a DC16 strength save or take 2d10 bludgeoning damage.

Cocaine Bear has 4 legendary actions per round

1 action:Slash and Run, the bear can take 1 slash attack and move up to half its speed without provoking attacks of opportunity

2 actions: Cocaine Infused Roar each target within 60 ft. of the bear must make a WIS save DC16 or become frightened of the bear

2 actions: Ground Slam the bear slams its paws into the ground causing a ripple of earth around it, each creature within 30 ft that is contact with the ground must make a strength save DC 16 or take 2d10 damage and fall prone, in addition the effected terrain becomes difficult terrain for all creatures other than the bear