I fell to the bottom of the world...

[JABIII]

So, uh, I summoned my mount while in the red ant hill. The mount was merged with the ceiling. I mounted said mount and took a few steps forward and fell through to the bottom of the world. I sent my mount home and proceeded to run to the southernmost edge of the, uh, 'underworld'? My character then 'died'. I entered the game after leaving because repair was not an option and I could not save because my character somehow did not exist anymore... I re-entered the game and popped up back at the starting location with an empty inventory... fun stuff.