C1860 The First Villain of the Prehistoric Era

This is so weird. Is this door full of oil and salt? Then why did this line of words appear on the door? Who was the one who did this?

"The key in your hand is useless. That key is for fun. I'll give it to you. Hurry up and shout the slogan. Otherwise, this door will disappear and you will never be able to enter it." Another line of words appeared on the door