I was reading the Beholder's statblock (MM, page 28):
Eye Rays. The beholder shoots three of the following magical eye rays at random (reroll duplicates), choosing one to three targets it can see within 120 feet of it:
- Charm Ray. The targeted creature must succeed on a DC 16 Wisdom saving throw or be charmed by the beholder for 1 hour, or until the beholder harms the creature. […]
If a PC is charmed by the Charm Ray, can he not repeat the check on his turn?
If the Beholder simply charms a PC and then doesn't attack him, can the charmed PC not attack or target the Beholder with harmful abilities or magical effects for the rest of the fight?