Constructed. The Robot does not require air. It also doesn't need to eat, drink, or sleep.
Multiattack. The Robot makes six slash attacks, or three beam attacks. Slash. Melee Weapon Attack: +6 to hit, reach 5 ft., one target. Hit: 6 (1d6 + 3) slashing damage. Light Beam. Ranged Spell Attack: +3 to hit, range 60 ft., one target. Hit: 7 (2d6) radiant damage.