If Lei Shen was born, how was he born?
Even among the mighty mogu of ancient Pandaria, Lei Shen was known as a military prodigy. The son of a warlord, Lei Shen aimed not simply to conquer weaker races, as his forebears had done, but to build a true empire.
We're told that Lei Shen was born the son of a warlord during the Age of a Hundred Kings when the mogu, bereft of leadership following the silence of Master Ra (Ra-Den in the mogu language) and their being left to their own devices. If this is so... if Lei Shen was someone's son, how was he born? The mogu of today have no females save two, the Twin Consorts, but Monara's anguished spirit indicates that they once did. Considering that Lei Shen discovered the Engine of Nalak'sha and the Forge of the Endless, perhaps the Thunder King simply decided to stop letting his people reproduce via the Curse of Flesh. It's often argued that the mogu reverse engineered the Curse, but it's possible that they also decided to return to using the technology of the creation forges for their reproduction and as such, no longer needed to allow women of their race to exist.