Multiattack

The fire giant makes two Flaming Greatsword or Lava Boulder attacks.

Flaming Greatsword

_Melee Weapon Attack:_ +11 to hit, reach 10 ft., one target. _Hit:_ 28 (6d6+7) slashing damage plus 4 (1d8) fire damage.

Lava Boulder

_Ranged Weapon Attack:_ +7 to hit, range 60/240 ft., one target. _Hit:_ 19 (3d10+3) bludgeoning damage plus 13 (3d8) fire damage.

Volcanic Burst (Recharge 5-6)

The fire giant expels built-up heat from within itself, sending a blast of lava outward. Each creature within 15 feet of the fire giant must make a DC 16 DEX save. On a failure, a creature takes 36 (8d8) fire damage and is knocked prone. On a success, a creature takes half the damage and isn't knocked prone. A creature that fails this save has disadvantage on the next save it makes against the giant's Pyroclastic Surge before the start of the giant's next turn.