C3509 It's Bitter and Sweet at the Same Time

The altar is old, but it doesn't decay with time because the material of the altar is eternal stone. Eternal stones were a type of rare ore, rumored to be materials used to construct the heavenly palace's city walls, everlasting and everlasting.

Heavenly Palace was a legend, no one having seen it before, so it was impossible to determine if it was true or false. However