A Walk Among The Creatures - T L Chapman - Bog

Unicorns, Yetis and the majestic Phoenix have one thing in common. Mankind couldn't have been more wrong about them.
If anyone would have asked Glade what the world was like outside of his village's hidden valley, he could only reply with what he had read about it. That is, if he wouldn't immediately get banished for reading or interacting with the items from the old world in the first place.
After his village is attacked and left vulnerable, Glade is the only hope they never wanted.
In a land where technology is myth and monsters are a reality, Glade ventures out into the unknown to find the old gods. Armed with banned knowledge and powers he doesn't understand, he must convince them to call back their creatures or else the last remnants of humanity will be lost.