Originally Posted by
KrazyK923
There is a theory that when we overwhelm our weapons with energy to seal Sargeras or do whatever it is we do to negate our artifact weapons going forward, that this enables Xal'atath to become a void creature as it once was (And, if the theories in the class hall tome are true, was an Old God herself), becoming an enemy in the next expansion.
Which I think would be pretty cool. Although the only reason I would say this is unlikely is I can't really see Blizzard making an entity a big villain that only one spec of one class really knew about.