Arctic Smilodon (Saber-Toothed Tiger)

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

Pounce. If the Smilodon 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 15 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.

Arctic Predator. The Arctic Smilodon has adapted to the Frozen Tundra. In an arctic environment, the Smilodon has :

• +2 to its AC which sets it to 16
• Advantage to Stealth and Survival checks

Bite. Melee Weapon Attack: +7 to hit, reach 5 ft., one target. Hit: 10 (1d10 + 5) piercing damage.

Claw. Melee Weapon Attack: +6 to hit, reach 5 ft., one target. Hit: 13 (2d8 + 4) slashing damage.

Ice Fangs (Recharge 5 or 6). When the Arctic Smilodon successfully makes a Bite attack, it can attempt to freeze the bitten creature. The target of the attack must make a Constitution saving through DC 13 at the start of their turn:

• On the first failure, they become restrained
• On the second failure, they take 7 (2d6) cold damage and are paralyzed
• On the third failure, they take 14 (4d6) cold damage and are petrified. 

On a successful saving throw, the effect ends and the creature is immune to it for the next 24 hours. Creatures immune to cold are immune to the effect.

A creature petrified in this way can be brought back to life via specific potions or spells such as Greater Restoration. Alternatively, if they are brought in a warm environment within the first hour of their petrification and remains there for 24 hours, they slowly unfreeze over the course of the day. They take one point of exhaustion.