Death-Throes. When the balrog dies, it explodes, and each creature within 30 feet of it must make a DC 20 Dexterity saving throw, taking 70 (20d6) fire damage on a failed save, or half as much damage on a successful one. The explosion ignites flammable objects in that area that aren't being worn or carried, and it destroys the balrog's weapons.

Fire Aura. At the start of each of the balrog's turns, each creature within 5 feet of it takes 10 (3d6) fire damage and flammable objects in the aura that aren't being worn or carried ignite. A creature that touches the balrog or hits it with a melee attack while within 5 feet of it takes 10 (3d6) fire damage.

Magic Resistance. The balrog has an advantage on saving throws against spells and other magical effects.

Magic Weapons. The balrog's weapon attacks are magical.