I like the iron ideas. I’ll look into it. As for dark magic, the limitations are limitations of knowledge. With dark magic, you can do anything except create souls and kill infinite beings, but most of the highest power spells have been lost from human knowledge. You can also get help from...
This system has light and dark magic, with dark magic accessible to anyone, and light magic only to fairybloods. Magic is connected with a kind of physic force, electromagnetic fields, and certain individuals (i guess with more fairy blood) are more powerful. Objects like crystals and wands help...
If you have Kindle Unlimited, my book The Adventures of Gardus Ningo should be free. I’d appreciate if you’d read it and give me any suggestions or tips.
I would use them as chaos beasts, like tanninim in Hebrew mythology. There is also surprising variance in sea serpents, such as some with sealish heads and yellow polka dots.