If you had a player w/a Giant Poisonous Snake as a #DnD Beast Master companion & they came into contact w/Yuan-ti would it be immune to the charm ability? #WotCStaff @JeremyECrawford
— B Lynn (@DaddyDM) October 10, 2019
The Ranger's Companion feature doesn't make the beast companion immune to the charmed condition.
If a rule confers immunity, resistance, or another special ability, that rule explicitly says so. #DnD https://t.co/2aGl53esNp
— Jeremy Crawford (@JeremyECrawford) October 10, 2019