Monocular Illusion Resistance. The cyclops has advantage on saving throws against illusions that include visual elements it can see.

Poor Depth Perception. The cyclops has disadvantage on attack rolls with a ranged weapon or melee weapon if the target is more than 5 feet away.

Multiattack. The cyclops chief makes three attacks: two with its claws and one with its bite; or it makes two attacks with its glaive or javelins.

Bite. Melee Weapon Attack: +7 to hit, reach 5 ft., one target. Hit: 12 (2d6 + 5) piercing damage.

Claw. Melee Weapon Attack: +7 to hit, reach 5 ft., one target. Hit: 8 (1d6 + 5) slashing damage.

Glaive. Melee Weapon Attack: +7 to hit, reach 10 ft., one target. Hit: 16 (2d10 + 5) slashing damage. 

Javelin. Melee or Ranged Weapon Attack: +7 to hit, reach 5 ft.  or range 30/120 ft., one target. Hit: 12 (2d6 + 5) piercing damage.

Aggressive. As a bonus action, the cyclops can move up to its speed toward a hostile creature that it can see.

Hypnotic Stare.  As a bonus action, the cyclops's eye becomes a twisting vortex of colors and it stares at a creature within 60 feet, who must make a DC 13 Wisdom roll or be charmed for one minute. While charmed by this spell, the creature is incapacitated and has a speed of 0. The condition ends for an affected creature if it takes any damage or if someone else uses an action to shake the creature out of its stupor. A target that successfully saves is immune to this cyclops's stare for the next 24 hours.