The Apocalypt is my favorite class from On the Rain Slick Precipice of Darkness, Episode 3. A seer, he predicts an event. Every prediction he makes alters the effect of the final event: when he predicts locusts, the event will deal wind damage. When he predicts boils, it'll cause poison, and so on and so forth.
He's wearing a rough wool robe with an apron that's meant to evoke a doomsayer's sandwich board. Not really, but that would have been a good idea. He's actually wearing it because it's hard to make robes look suitably dynamic.