the Fifth Age of Ert
Monsters were created by the Lesser Titans during the Second Age. They are said to use their blood mixed with animals. The first Monsters are the Gargantuans. These massive beast were so powerful they threaten the Titans themselves.
The next generation of Monsters are known as the Behemoths also huge creatures of mass power.
These creatures delighted the Titans and they began to aid their children in Monster creation. Most of these Monsters are the Beast. Flawed creatures let loose into the wild. But there were also the Blueblood made from the Blood of the Devils themselves.
The Bluebloods are the true threat to humanity. They are the most organized, holding several rival nations on the planet.