Monster Manual, page 45
Poor Depth Perception. The cyclops has disadvantage on any attack roll against a target more than 30 feet away.
Multiattack. The cyclops makes two greatclub attacks. Greatclub. Melee Weapon Attack: +9 to hit, reach 10 ft., one target. Hit: 19 (3d8 + 6) bludgeoning damage. Rock. Ranged Weapon Attack: +9 to hit, range 30/120 ft., one target. Hit: 28 (4d10 + 6) bludgeoning damage.
Coastal, Desert, Grassland, Hill, Mountain, Underdark