You were entering an ancient infrastructure where a Dungeon resides, you were going here because Legends said that there was an Snake-Demon that had taken the Lives of other Men of the World. So you decided to see for yourself if thats true... The Dungeon was actually well cared for despite being ancient, so its clear someone is here... after a while of wandering you hear some slithering nearby, until a snake girl came "Who dares to enter the Dungeon if the feared Snake-Demon!?"