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.

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

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

Multiattack. The balor makes two attacks:  either two with its longswords or one with its longsword and one with its whip.

Longsword. Melee Weapon Attack: +7 to hit, reach 10 ft., one target. Hit: 16 (2d8 + 8) slashing damage plus 7 (2d8) lightning damage. If the balor scores a critical hit, it rolls damage dice three times, instead of twice.

Whip. Melee Weapon Attack: +14 to hit, reach 30 ft., one target. Hit: 15 (2d6 + 8) slashing damage plus 10 (3d6) fire damage, and the target must succeed on a DC 20 Strength saving throw or be pulled up to 25 feet toward the balor.

Round two. Demonic Roar: At the start of the round, the balor will let out a roar and everyone within 10ft range must succeed on a DC 20 Dexterity saving throw or get knocked back 20ft and prone.

Round Four. Whip Smash: At the start of the round, the balor will crack the whip in either a line or a point within range. If in a line, 30ft of flame will burst along the line of the whip and deal 30 (6d10) fire damage unless targets succeed a DC 15 saving throw. If they succeed they take half damage. If at a point, every creature within 15ft radius of the chosen point must take 30 (6d10) unless target succeeds on a DC 20 Dexterity saving throw. On a success they take half damage.

Round Six. Inhumane Rage: At the start of the round the balor will lower its whip and make six attacks at disadvantage with its longsword.

At 2/3 (175) health. Summon Whip: When the balor hits 2/3 of max health it will summon its whip.

At 1/3 (87) health. Reckless Attack: When the balor hits 1/3 of max health it will make a reckless attack on targets within range.