Multiattack

The giant attacks twice with its greatsword.

Greatsword

Melee Weapon Attack: +14 to hit, reach 10 ft., one target. Hit: 30 (6d6 + 9) slashing damage.

Rock

Ranged Weapon Attack: +12 to hit, range 60/240 ft., one target. Hit: 44 (10d6 + 9) bludgeoning damage. If the target is a Large or smaller creature it makes a DC 22 Strength saving throw falling prone on a failure.

Lightning Strike (Recharge 5-6)

The giant throws a lightning bolt at a point it can see within 500 feet. Each creature within 10 feet of that point makes a DC 18 Dexterity saving throw taking 56 (16d6) lightning damage on a success or half the damage on a failure.

Sword Sweep (While Bloodied)

The giant makes a greatsword attack against each creature within 10 feet. Each creature hit with this attack makes a DC 22 Strength saving throw falling prone on a failure.