I Became the Youngest Disciple of the Martial God

It was a peculiar mark.

It looked like an upside-down triangle surrounded by a circle of varying symbols.

It would be hard to explain it in more detail than that.

This mark was placed decently close to the Sapphire Snake. To be precise, the mark was close to the entrance of the cave we’d entered.

“...What is this?”

“It’s an upside-down tower. They are ancient buildings hidden in multiple places around the world.”

Evidently it was a tower, not a triangle. But what did it mean?

“The altar of a forgotten god. You should understand what I mean.”

“Ah.”