C1422 He Has to be Willing
The Underground Loulan was located under the Taklamakan Desert. It was a place where sunlight was the most poisonous in the world.
There were seven suns in the Underground Loulan. Every noon, the seven suns would form a line and bask in the sunlight.
That was why the black rock in a certain area of the black rock mountain would be exposed to the sun. That was the legendary Asura Gall