Actions

Multiattack Quelaag makes two attacks with her sword and one with her bite.
Sword Melee Weapon Attack: +7 to hit, reach 5 ft., one target. Hit: 1d8+3 slashing damage, plus the additional fire damage from above (+6d6 fire damage)
Bite Melee Weapon Attack: +7 to hit, reach 5 ft., one target. Hit: 2d6+3 piercing damage.
Lava Discharge (Recharge 5-6) Quelaag's spider mouth spits out lava in a 15 foot cone. Each creature in the cone must make a DC 15 Dexterity Saving Throw, taking 13d6 fire damage on a failed save, or half as much on a successful one.
Heat Pulse (Recharge 5-6) Quelaag radiates an intense heat from her body, damaging everything around her. Creatures within 10 feet of Quelaag must make a DC 15 Constitution Saving Throw, taking 13d6 fire damage on a failed save, or half as much on a successful one.