Flying Wyverns: Similar to the dragon these creatures evolved in a normal way but had a breakthrough during the predatory times. These lizards evolved shells that could protect from the more dangerous predators such as ancient fanged wyverns and brute wyverns. The shells were still not enough and over time grew bigger and evolved wings. But while this happened above ground creatures even older than Zhegrus grew wings too, but left to live in the caves were unlike the other wyverns they didn't need shells. soon after wyverns became more wide spread and took over the title of main monster.