Every good fantasy story needs a monster. It could be a kraken, huge shark, vicious hounds, or even destructive children.
They terrorize the village, devour pets, take bites out of boats, glom onto airplanes, and, if children, smear food all over walls.
They leave destroyed evidence in their wake. People hide inside when they are about. Some will refuse to fly or swim or sail. Some will refuse to bear children of their own.
Your task is to write a story in which there is at least one monster. The level of destruction should be sufficient enough to cause terror.
Have fun with this one.