Coffin 

I didn't move from my spot for ten minutes after they left. 

I had asked Nero to check multiple times to look around before I dared to even take a breath.

I didn't want to take a risk when it came to Peak-Earth Sovereigns. Who was acting strangely?

I slowly moved toward the spot they have been and soon reached it and was quite surprised. There is not even a speck of aura; it seemed like they didn't want to leave anything behind.

"What did they do?" I asked Nero.

"They have buried something underground," he replied immediately.

"Is it deep?" I asked. "No, it is barely a meter down under," he said and jumped on the place in front of me, and a moment later, seeped into the ground.

For a second nothing happened, before finally, the earth begins to move and a hole began to form, before finally, I saw what they buried in the ground.