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

Lightning Body. A creature that touches the tiger or hits it with a melee attack while within 5 feet of it takes 4 (1d8) lightning damage.

Pounce. If the tiger 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 tiger can make one bite attack against it as a bonus action.

Bite. Melee Weapon Attack: +5 to hit, reach 5 ft., one target. Hit: 8 (1d10 + 3) piercing damage.

Lightning Breath (Recharge 5-6). The tiger exhales lightning in a 30-foot line that is 5 feet wide. Each creature in that line must make a DC 12 dexterity saving throw, taking 22 (4d10) lightning damage on a failed save, or half as much damage on a successful one.

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