When I Was A Ghoul

Forty years ago, an ancient Tomb of the Warring States was washed out of the waters. Forty years later, a mysterious will from my grandfather once again brought me to the grave. Deep Mountain Ghost Village, Black Haired Zongzi, Yin-Yang Boy, my comrades and I will most likely die here, but we will still be unable to escape this cursed land! 
What exactly was it that caused two groups of grave robbers to all die tragically? What was it that scared Grandpa out of his wits? There was no shoveling at all, and the lights were out and the gold was not touched. The moment I opened the coffin, I knew that there was something more terrifying than ghosts …