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

Pack Tactics. The lion has advantage on an attack roll against a creature if at least one of the lion’s allies is within 5 feet of the creature and the ally isn’t incapacitated.

Pounce. If the lion moves at least 20 feet straight toward a creature and then hits it with a claw attack on the same turn, that target must succeed on a DC 13 Strength saving throw or be knocked prone. If the target is prone, the lion can make one bite attack against it as a bonus action.

Running Leap. With a 10-foot running start, the lion can long jump up to 25 feet.

Bite. Melee Weapon Attack: +5 to hit, reach 5 ft., one target. Hit: 7 (1d8 + 3) piercing damage.

Claw. Melee Weapon Attack: +5 to hit, reach 5 ft., one target. Hit: 6 (1d6 + 3) slashing damage.

Multiattack. Scar makes two attacks, one with his bite and one with his claws.

Scar can take 3 legendary actions, choosing from the options below. Only one legendary action option can be used at the end of another creature's turn. Scar regains spent legendary actions at the start of its turn. 

Attack. Scar makes one claw attack.

Detect. Scar makes a Wisdom (Perception) check. 

Move. Scar moves up to his speed without provoking opportunity attacks.