Mu is a sunken continent in the Pacific Ocean. Before it sank,
Mu is believed to be the place where humans first appeared.
The ancient Muvians worshipped countless gods, but the most
important ones were the three "sons" of Cthulhu: Zoth-Ommog,
Ghatanothoa, and Ythogtha. It was the Muvian's reverence for
this triad of brothers that may have hastened their downfall.
There is much speculation about what caused Mu to sink into
the ocean. However, the Zanthu Tablets offers the best
explanation. According to the tome, the high priest Zanthu
angered the Elder Gods when he attempted to summon Ythogtha
to challenge the power of Ghatanothoa. In retaliation, the Elder
Gods destroyed Mu and sank it beneath the waves.
Mount Yaddith-Gho is a towering basalt mountain on the
continent of Mu. Its peak is topped with a colossal, ancient,
stone fortress which legends claim was built eons ago by a race
of beings that came from the planet Yuggoth. Inside the fortress
is a huge trapdoor that seals an
entryway to the interior of the
mountain.
More than 200,000 years ago, Mount Yaddith-Gho was situated
in the kingdom of Kn'aa. The mountain was sacred because it
was the dwelling place of the god Ghatanothoa. Priests of
Ghatanothoa built a temple at the mountain's base and offered
regular sacrifies to the god, lest Ghatanothoa emerge from the
bowels of Mount Yaddith-Gho, crawl down its slopes, and bring
doom to humankin