This is a fantasy-science world full of monsters. Humans study the ecology of various monsters through adventurers, hoping to maintain a balance between people and monsters. Yet among them are the Elder Dragons, roaming calamities. These strange and powerful creatures are far beyond the limits of human scientific understanding. They represent both natural disasters and the creation of life. Each Elder Dragon embodies a force of nature, and wherever one appears, the local ecosystem changes or even collapses under its immense power...
