In actual combat, unless science and technology can achieve infinite energy, survive in various harsh environments, interstellar colonization, ecological system transformation, stable space portal, immortality, creation of new species and other technologies are mastered, it is possible to fight World War I and impossible to win.

Well, the ancients realized these technologies before humans, and then fought a protracted war with the family of the stars, the deep divers and the flying hydra under the old mage. Later, due to its own degradation and Shoggoth's rebellion, it was destroyed.