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

Pounce. If the panther moves at least 20 feet straight toward a creature and slams into it on the same turn, that target must succeed on a DC 15 Strength saving throw or be knocked prone. If the target is prone, the panther can make one bite attack against it as a bonus action.

Telepathy. The panther can create a telepathic link with a willing creature. Through this, they can both share thoughts, images, words, and sounds with each other. Any creature with at least intelligence of a 2 can understand what the panther is saying.

Transformation. The panther can transform into a humanoid being for any amount of time. It can turn back at will anytime. 

Bite. Melee Weapon Attack: +4 to hit, reach 5 ft., one target. Hit: 5 (1d6 + 2) piercing damage.

Claw. Melee Weapon Attack: +4 to hit, reach 5 ft., one target. Hit: 4 (1d4 + 2) slashing damage.