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.
Firey Sprint. Movement attack: Will run at such high speeds it will create a wall of flames behind it. Speed +50 roll d6 if anyone touches the wall.
Fire Spinner. Spell: Can run in a circle and create a giant fire tornado. Roll d10 for tornado damage.
Fire Breath. Ranged Attack: Breaths fire roll d10 +7. Range: 10ft +1 for each level after level 5.
Description
The Nemean Lion looks like a large lion with fire for a mane and golden fur. It can't be killed with ordinary/common weapons because its golden fur is impervious to attack, but it is weaker towards col and water attacks. Using fire or storm attacks will do nothing but make him stronger.