Charge. If the dolphin moves at least 30 feet straight toward a target and then hits it with a slam attack on the same turn, the target takes an extra 3 (1d6) bludgeoning damage.
Hold Breath. The dolphin can hold its breath for 20 minutes.
Slam. Melee Weapon Attack: +4 to hit, reach 5 ft., one target. Hit: 5 (1d6 + 2) bludgeoning damage.