Lei Shen's life changed forever when he stumbled into a dark chamber below what are now the Mogu'shan Vaults. Legend has it he found an ancient titan keeper guarding a miraculous device.
During his reign, Lei Shen labored to build a mechanical servant that would defend his citadel without fear. When his first attempt failed, rage took hold of the Thunder King.
Lei Shen commanded his sorcerers to mold an aberration that could peer into the hearts of his followers and detect betrayal. From this decree, Durumu was given life.
Even the most callous among the mogu quaver at the thought of the dark experiments performed at the Thunder King's behest. Long ago, a young cloud serpent was twisted into a multi-headed hydra.
Over the millennia, small amounts of mogu flesh-shaping magic seeped into the caverns below the Thunder King's citadel. The dark energies warped one of the chamber's native dragon turtles.