[A wise decision, because he is totally wrong and Karkat wouldn't be kind in correcting him.]

It varies, but they're not as common as the curses. The most I've seen is four in an earth year, the least is one in a year. Some are more serious than others, but like the curses themselves, you can't tell what it's going to be until it happens. I've seen pirate ghosts, dinosaurs, rotting fish monsters, a kraken, and a transforming orb of darkness, though I've heard of at least one other attack before I showed up in this place.