Multiattack

The giant attacks twice with its glaive.

Glaive

Melee Weapon Attack: +12 to hit, reach 15 ft., one target. Hit: 24 (3d10 + 8) slashing damage. If the target is a Large or smaller creature it makes a DC 20 Strength saving throw. On a failure it is pushed up to 10 feet away from the giant and knocked prone.

Rock

Ranged Weapon Attack: +12 to hit, range 60/240 ft., one target. Hit: 39 (9d6 + 8) bludgeoning damage. If the target is a Large or smaller creature it makes a DC 20 Strength saving throw falling prone on a failure.

Fog Cloud (1st-Level; V, S, Concentration)

The giant creates a 20-foot-radius heavily obscured sphere of fog centered on a point it can see within 120 feet. The fog spreads around corners and can be dispersed by a moderate wind (at least 10 miles per hour). It lasts for 1 hour.