Here we have a merman, he is an entity and will help you with all your sea magick. He is quite adept at it and can and will enhance your own innate abilities. So if you have wanted to know sea magick this is your chance. He is not sexual in any way with humans. I just thought I'd point that out. :)
He can and will also help you with your other sea spirits/entities as well. He is bound to a seashell that I found at the sea the other day and will come with his own charger.
He can show you his realm if you wish and draw other mer-creatures to you although they may/may not stay.