Corythosaurus

Call. The Corythosaurus has a special call for each situation. It can take a free action to communicate with other Corythosaurus. It has four calls to buff its allies:

• Defensive Call (Action). The Corythosaurus lets out a series of calls and instructions, all of its allies that can understand it have +2 to AC and 5 temporary HP for 3 rounds. This effect stacks twice.
• Survival Call (Bonus Action). The Corythosaurus instructs its allies and releases an undetectable pheromone. All of its allies get hungry and thirsty half as quickly, and has advantage on Stealth checks and Constitution saving throws for 2 minutes.
• Herding Call (Free Action). The Corythosaurus alerts all of its allies, each of which within 60 feet may use their reaction to move up to 20 feet into a tight formation that provides +4 to AC and Intimidation.
• Courageous Roar (Action). The Corythosaurus roars courageously, causing all of its allies within 60 feet of it to gain +2 to Intimidation and attack rolls, and +6 to damage for 2 rounds. This effect stacks twice.

Herding. Per herd member, the Corythosaurus has a +2.5 to speed, +1/4 to attack bonuses and damage, and +1 to HP. The Corythosaurus has advantage on Intimidation, Insight, Nature, and attack rolls when it has at least 2 other herd members within 25 feet.

Headbutt. Melee Weapon Attack: +4 to hit, reach 5 ft., 1 target. Hit: 8 (1d10 + 2) bludgeoning damage.