One of the two core commons of the Mountain Vargath. Brutes generally lead the push. A key aspect of the Brute is that it is a great position stealer. It slowly advances to the position the Mountain Vargath want to take, generally the front of a gate, by moving the enemy units away.
You can move the brute next to the space you want to take and then if the opponent fails to kill it, move away any unit in the way to take that spot. This makes them exceptionally good to lead the push with their high health and the threat to take any spot with relative ease.
In combination with Glory Callers, which force them 1 space, they can take spots by surprise and also threaten champions and summoners to be moved into a bad position, as their ability makes no discrimination.
You should try to have one Brute on the field at all times leading the pushes, but multiples of them are also good and a team of Brutes can do some nasty tricks with their ability, especially combined with Glory Callers.