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
creature
electric eel
I am an eel. I swim around in the king's moat. I was brought here from far away by a foreign diplomat, and I have lived here for many years scaring away unruly citizens.
Ooh! and what kind of creature might you be? Whoa! You saw me? I'm impressed! Certainly you are smarter than the humans of the castle! If you are scared, do not be. I only eat flies... mostly! I am from the castle. I live in the moat around it. I eat flies to if they get to close to the water. Ah! Then we are in the same boat! We thanklessly eat the flies that the humans despise, and yet they show no respect! I do wonder how I got all the way out here. I do recall there being a monstrous flood. Oh, there was! Some stupid human children decided that blocking up the irrigation system would be tremendous fun. They got their own personal lake out of the deal, and we all got displaced.  I could have wound up all dried up on the battle field! Those little! Indeed. I am not above a prank or two, myself. But humans show no regard for the lives of others. While the pantry flies were quite tasty, I think I'll make a new start here in the swamp all things considered! Yes, the flies are plentiful it seems. Plus no one can even get close to me because they would be in for a shock. Ha! T'would appear so! Mind if I make my new home near to yours? You make fine company, and we might have dinner sometime! Yes! you would make a fine neighbor. I also enjoy eating magots. I will gather us up some so we can eat them together. Wonderful! It has been quite a long time since I've enjoyed a fine maggot salad! Perhaps we should thank those brats that started the flood!