When 'MAGIC’ isn’t enough of an explanation for you, writing fantasy can be hard as balls.
The only way I can allow a mythical creature into my books is by making them as real as possible. Take vampires for example…
Chapter 21 from FATAL RETRIBUTION, The First Raina Kirkland Novel:
“Vampire blood is dark red, almost black, and the cells are crowded and deformed. When the disease is introduced into a living host, it quickly spreads throughout the body through the circulatory system. It violates every organ, changing their purpose or consuming them entirely. The stomach develops a smooth, thick inner wall that no longer produces acid. The small intestine is shortened and redirected to the heart, where it does somewhat the same job as a human heart. The lower bowls are seemingly recycled by the body, as is excess fatty tissue. This gives the vampire a leaner appearance. The lungs are in good working condition. Though, they seem to have the capacity to hold a great deal of oxygen, allowing the vampire to hold his breath for an extended period of time. Their bones are denser, heavier and stronger. The disease seems to affects the host’s ability to produce heme, a key element in hemoglobin. This causes a severe case of Porphyria, normally a genetic malady. Porphyria has many symptoms, but vampires only suffer from one, sensitivity to light. The light sensitivity is amplified to a deadly degree, causing the vampires to burn through and through.”
It's always a bit of a challenge to write fantasy for me mainly because I don't believe in such nonsense. Angles, demons, gods, devils, vampires, werewolves, mermaids...nah, I can't make myself even consider them...but I want to image a world where they're real and human and possible, so I have to make them possible. Gods are aliens from another planet, who have advanced to the point of interdenominational space travel. Their minds are so advanced that they can manipulate matter on a microscopic level...but they have a weakness in their pious arrogance. Angles were created by the gods as servants. They are sentience energy who can use that energy to create tangible illusions and manipulate matter to a lesser degree. When gods and angels are cast out of the minority party, they are branded devils and demons... as for mermaids and other mythical creatures...well, that would be Earth A History:
Chapter 40 from GRAVE OMEN, The Third Raina Kirkland Novel:
And, then there was Earth, a tiny, insignificant planet, a grain of sand in an ever expanding desert. Life on Earth answered only to the chaos of nature, and it prospered. But as beings of intelligence evolved, Earth gained the attentions of the gods. These creatures: fish, reptiles, birds and mammals intrigued the gods. They had unique qualities; most notable was their capacity for strong emotion. The gods joined them for a time and they learned of fear, anger, jealousy, lust, love, loyalty and greed. They were as children in their understanding and self-control. The gods became petty, lustful creatures. They mated themselves with the Earthlings and in doing so created new life forms, half god and half animal. These creatures were called humans; not completely animal, but not completely god.
“Now, the gods had minions called angels, created by the gods for the mere purpose of servitude. They were stoic creatures of pure energy. The angels cared nothing much for life forms until they witnessed the creation of the human race. Humans were as flawed as any other animal, yet held inside them a piece of divinity, a whisper of something greater. The angels fell in love with them, and many of them mated with the humans. What came of these unions were new races of humans, varied and terrible, monsters capable of great feats of power: witches, elves, fairies and so on.
I know I'm not brilliant. I'm certainly no scientist...but I try to satisfy