A mishap involving a broken magical artifact leads to one of the strangest phenomena occurring in several thousand years: transportation to another world entirely. Feaurax, a star pupil of the legendary Asheron, finds himself in a pretty big pickle when he lands (literally) face first in a new world with new creatures to befriend. What starts off as a 'get home safely' kind of plot turns dark as not everyone who was a friend still is, and not everyone who was an enemy still is.
Only good things can come of this.
This is a crossover with the used-to-be-reasonably-well-known MMORPG Asheron's Call.
Cover image is a screenshot of portal space from Asheron's Call. I no longer play, so I couldn't grab the screenshot myself. This in particular is from Joystiq's review of the game from a few years back, at the url http://www.blogcdn.com/massively.joystiq.com/media/2011/01/screenshot00005.jpg. The actual review is here. Hope they don't care, but if they do, I'll gladly take it down.
Oh yeah, one last thing. I own neither Asheron's Call nor MLP. If I did, I'd be a lot better off than I am.