D&D 5th Edition Data Explorer

Death Throes
When the balor 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 balor's weapons.
damage:
- 20d6
  Fire
dc:
dc type:
DEX
dc value:
20
success type:
half
Fire Aura
At the start of each of the balor'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 balor or hits it with a melee attack while within 5 feet of it takes 10 (3d6) fire damage.
damage:
- 3d6
  Fire
Magic Resistance
The balor has advantage on saving throws against spells and other magical effects.
Magic Weapons
The balor's weapon attacks are magical.