Yea, so in Before Corruption: Chapter Two: Ruling the Monarch Kingdom, Chrysalis finds a large steel door leading towards a downward spiral staircase. And this is what is revealed when she ventures down there and what is told shows you why there is so much protection just to get to it. Her Father has untold secrets that Chrysalis finds and she knows it must be kept hidden. A letter deep within the dungeon itself also reveals some closer connection between Sombra and Chrysalis. With her new found experiences, found inside the dungeon, she decides to write her own clopfic. The reputation of her family and her own all sits on if the secrets of the dungeon get out.