Looking for a Grave Without Saying a Word

I woke up from the tomb and lost all my memories. Where is this place and who am I? Eyeless evil corpse, drum-beating stone man, mysterious murals, man-eating monsters, endless pits. Countless horrible and bizarre things are happening around me. Where should I go and how can I save my life? I finally escaped, but what awaited me was an even bigger mystery, a hanging coffin on the seabed, a fatal abyss, and the beginning of a mystery. In the struggle between two huge forces, my position is particularly important. The story has just begun.