The symbol of the Calamity Ruin Beast was not something that exactly reflected a good image.
For someone to use it like this in a vault was a display of arrogance. It basically meant that they were fine associating their image with an ominous beast like the Calamity Ruin Beast.
This made Lin Mu think that whatever power this vault belonged to, it wasn't exactly a good one.
'If it weren't for the fact I'm in a dream, I would be quite worried about being in here.' Lin Mu thought to himself.
Having at least figured out what beast the symbol was derived from, Lin Mu decided to explore the vault further.
"Maybe there are other clues to what place this is or whom it belongs to," Lin Mu reckoned.