Flyby. The snake doesn't provoke opportunity attacks when it flies out of an enemy's reach.

Magic Resistance. The fire snake has advantage on saving throws against spells and other magical effects.

Fiery form. The fire snake deals 7 (2d6) fire damage to any creature it is in contact with It can also move through gaps up to 1 inch wide, provided that lava could flow through it.

Illumination. The snake sheds bright light in a 30-foot radius and dim light in an additional 30 feet.

Water Susceptibility. For every 5 feet the elemental moves in water, or for every gallon of water splashed on it, it takes 1 cold damage.

Bite. Melee Weapon Attack: +6 to hit, reach 5 ft., one target. Hit: 6 (1d4 + 4) piercing damage plus 11 (2d10) fire damage.

Fire ray. Ranged Spell Attack: +4 to hit, range 600 ft., two targets within five feet of each other. Hit: 10 (3d6) fire damage. If the target is a creature or a flammable object, it ignites. Until a creature takes an action to douse the fire, the target takes 5 (1d10) fire damage at the start of each of its turns..

Fire Breath (Recharge 5–6). The snake exhales fire in a 15-foot cone. Each creature in that area must make a DC 13 Dexterity saving throw, taking 17 (5d6) fire damage on a failed save, or half as much damage on a successful one.