Cocaine Bear

Blood Frenzy. The bear has advantage on melee attack rolls against any creature that doesn't have all its hit points.

Charge. If the bear moves at least 20 feet straight toward a creature and then hits it with an attack on the same turn, that target must succeed on a DC 17 Strength saving throw or be knocked prone. If the target is prone, the bear can make one bite attack against it as a bonus action.

Drug Rage. While under the effects of the drug the bear can't be charmed or frightened and have resistance to all damage except psychic damage.

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

Relentless. If the bear would be reduced to 0 hit points  but not killed outright, it can drop to 1 hit point instead. The bear can't use this feature again until it finishes a long rest.

Multiattack. The bear makes three attacks: one with its bite and two with its claws.

Bite. Melee Weapon Attack: +9 to hit, reach 5 ft., one target. Hit: 9 (1d8 + 5) piercing damage.

Claws. Melee Weapon Attack: +9 to hit, reach 5 ft., one target. Hit: 12 (2d6 + 5) slashing damage.

The bear can take 2 legendary actions, choosing from the options below. Only one legendary action can be used at a time and only at the end of another creature's turn. The bear regains spent legendary actions at the start of its turn.

Move. The bear moves up to its speed without provoking opportunity attacks.

Bite  (Costs 2 Actions). The bear makes an bite attack.