Actions

Multiattack. The giant makes two greatsword attacks.   Greatsword. Melee Weapon Attack: +14 to hit, reach 10 ft., one target. Hit: 30 (6d6 + 9) slashing damage.   Rock. Ranged Weapon Attack: +14 to hit, range 60/240 ft., one target. Hit: 35 (4d12 + 9) bludgeoning damage.   Lightning Strike (Recharge 5–6). The giant hurls a magical lightning bolt at a point it can see within 500 feet of it. Each creature within 10 feet of that point must make a DC 17 Dexterity saving throw, taking 54 (12d8) lightning damage on a failed save, or half as much damage on a successful one.   Variant: New Giant Options
Some adult storm giants can channel thunderous power through their bodies and release it with a deafening stomp. This ability is represented by the following action option.   Thunderous Stomp (Recharge 6). The storm giant stomps the ground, triggering a thunderclap. All other creatures within 15 feet of the giant must succeed on a DC 17 Constitution saving throw or take 33 (6d10) thunder damage and be deafened until the start of the giant's next turn. On a successful save, a creature takes half as much damage and isn't deafened. The thunderclap can be heard out to a range of 1,200 feet.
Source: SKT, page 246

Suggested Environments

Coastal, Underwater