Looks like a pretty big Game bug atm.

[Izziligent]

It seems that any skill that has a chance to teleport you, also has a chance to move you outside the playable area of the map. Had someone ontop of the ceiling of the map before, and now as I'm playing as a DM against bots all three of them ended up on the outside of the map because the wizard again had found his way out there. Here's a screenshot: http://puu.sh/245fZ

It seems that the teleporting Backstab potion skill of the Theif can do this aswell.