Frostfoot

If you're looking for the non-variant monster, see Clubfoot.

Frostfoot is a man that's been split in half and has been completely frozen over. He can be heard breathing heavily, wheezing, and stomping as he travels throughout the maze.

Mechanics (Spoilers)
He'll only get aggressive if you look at him, otherwise he will not attack. It is possible to identify him by his heavy breathing. You do have a brief grace window if he triggers, which is indicated by a loud yell. If he yells, you can turn around and try to run away from him, as he will lose interest after a few seconds.

The differences between Clubfoot and Frostfoot are their speed and chase times. Frostfoot is a little slower, but chases players for a longer period of time.

Trivia

 * Clubfoot and Frostfoot are voiced by a crowdfunder: content creator Ezekiel_III.