All the servers crash, the hard drives that contain every character data in game erases, and Everquest officially sunsets and ends abruptly...
Tbh, that is not accurate. What happens is in fact that the two sets of universal RNG necesary to ceate that situation creates a causality paradox, forcing two parallel universes to co-exist in time and space, which again creates a vacum bomb big enough to anihilate both universes, as well as nearby universes in the multiverse. Also, it would delay the announcement of the expansion, which would lead to some seriously angry posts from yours truly.
What's crazy is when it's two different classes that have the same parse. A Wizard and Ranger in RA did this in TDS once - mindblown!
What if it lands on its side? I'm sure the game arbitrates it somehow, even if somewhat randomly, ex: first to engage, truly random or alphabetically.