Source of the Concept Diagrams

The sky was gray, and visibility was very low. The three glowing balls in the sky barely allowed one to see dozens of meters ahead, and one could only see a blurry outline from afar.

The four of them followed the half-finished map and carefully identified their bearings. Every time they encountered a huge obstacle, they had to take a detour in advance.

Therefore, as they walked, the four of them gradually could not estimate how far they had gone from the stronghold.

Suddenly, a gust of cold wind blew past, and they suddenly felt uncomfortable. A cold aura seemed to have a mind of its own and wanted to enter their bodies. The four of them subconsciously stopped in their tracks.

"Is this the graveyard?"

Chen Yiming observed his surroundings and could only see graves all around him.