This morning I dreamt I was walking in a dark cavernous grotto littered with classical columns and marble debris. The stone cavern walls and marble debris surrounding the grotto had a blood red glow to it, the light dappled by the water. The large lake in the center glowed like an illuminated swimming pool. If you looked into the water, you could see various tiny humanoid shapes swimming in the distant depths sillouetted against the glow coming from the bottom. I walked to the edge where a merman waited, his upper half raised out of the water with his fish half undulating in the water. He was more like Glaucus than a typical merman, in fact I called him something like Glaucon or Glauca. He talked about someone named J., Jay, or Jesus. While we were talking two scaley humanoid monsters sprang out of the water and tried to pull me under from the rocky shelf where I was kneeling. While I was fighting them off, I pulled a capsule out of nowhere and cracked it open then poured the contents over the monsters. It was something caustic like holy water or acid because it burned them and forced them to let go of me. It must have been scary because I woke up and told myself about the dream so I would have a memory of it later.