Stone Camouflage. Rihuud has advantage on Dexterity (Stealth) checks made to hide in rocky terrain.
Two Heads. Rihuud has advantage on Wisdom (Perception) checks and on saving throws against being blinded, charmed, deafened, frightened, stunned, or knocked unconscious.
Multiattack. Rihuud makes two unarmed strikes.
Unarmed Strike. Melee Weapon Attack: +9 to hit, reach 10 ft., one target. Hit:13 (2d6 + 6) bludgeoning damage.
Rock. Ranged Weapon Attack: +9 to hit, range 60/240 ft., one target. Hit:28 (4d10 + 6) bludgeoning damage. If the target is a creature, it must succeed on a DC 17 Strength saving throw or be knocked prone.
Rock Catching. If a rock or similar object is hurled at Rihuud, the giant can, with a successful DC 10 Dexterity saving throw, catch the missile and take no bludgeoning damage from it.