I reincarnated as a stone

Summoning

Limy and I went straight down to the basement, and from there entered the dungeon. The moment I walked through the door the counter started running again.  

“I guess that's why dungeon cores are considered to be the heart of the dungeon. Much like a heart pumps blood through the veins, dungeon cores pump power through the halls... I can probably forget about the idea of ​​leaving rooms directly inaccessible.”

Luckily the dungeon didn't disappear during the time I was out, so even if it was completely inactive there was no need to worry about it self-destructing or anything of the sort.

"Okay, nothing I can do to speed up the construction of the room, so let’s leave it aside for the time being and focus on the main thing."

I had no idea how to summon a demon, but I figured that singing