Overrun

Prerequisite: Cavalier mount or animal companion, Strength 17 or higher

The mount can use its action or bonus action to attempt to overrun an adjacent creature. The mount makes a Strength (Athletics) check contested by the target's Strength (Athletics) check. The mount has advantage on its check if immediately previously it moved at least 10 feet straight toward the target, or if it is larger than the target, but disadvantage if it is smaller than the target. If the mount wins, the target is knocked prone and the mount moves through that creature's space and keeps moving the rest of its speed unimpeded. This movement does not provoke an opportunity attack from the creature.