The light doesn't pierce the heavy overhanging trees in this near pitch black area of the swamp.  The water is extremely murky and there are occasional fins poking up from the water belonging to some kind of creature.  The air is thick and heavy and insects constantly buzz about.
Darkest part of the swamp, Swamp
electric eel
creature
I creep and crawl about in the dark corners of the castle. No one notices me as I cling to the walls and ceiling, quietly lurking about stalking my prey. My favorite snack are the flies that linger in the pantry. I am loyal to no one but myself. Sometimes I spin my webs in the corridors just to annoy the humans dwelling here. Oh yes, I am mischievous!
This looks like a good place to catch flies... There are many tasty creatures if you are fast enough to ctch them. Oh that I am.  You look very tasty yourself. I wonder how fast you'd be with my lightning running through your body. I am but a small morsel to you. There are other things much bigger and there are plenty of insects here for the both of us. Besides what is that creature that has fins poking from the water? That is a swamp dragon. If see more that its fins, it will be the last hing you ever see. Beware. How do you keep from getting eaten by it? Be quiet and stealthy and when you hear it roar, hide! It gets noisy when hungry and it won't stop until it is satisfied. Is there enough in this water for it fill its belly? Yes, there are many large bottom dwelling creatures in the muck that can satisfy even a dragon's appetite.  Maybe we should lure them to the surface so that the dragon can catch them. Do they come to the surface for bugs? No, they eat creatures like us. The last thing we want is for them to notice us. When they move the water ripples mightily, that's how the dragon finds them.