Bugs Amphibians and the Rise of Giants
Eon XXX – The Age of Bugs (Carboniferous)

Eon XXX – The Age of Bugs
The Swamp Crown
“Giant insects and towering forests dominate the land, while swamps teem with life.”
Eon XXX was a world of vast swamp forests, choking heat, and air made dangerously rich by the endless green abundance of the land. Great club mosses, horsetails, ferns, and towering primitive trees spread across immense lowlands, forming steaming jungles and drowned woodlands that seemed to have no end. Rot, peat, and black water gathered beneath their roots, while the breath of the forests thickened the sky itself. In this age the continents were not merely green. They had become overgrown beyond measure.
That abundance changed the nature of life. Oxygen rose to heights unknown in later ages, and the smaller crawling creatures of earlier worlds expanded into monstrous forms. Dragonflies with hawk-like wingspans hunted above the swamps. Giant scorpions stalked the undergrowth. Enormous millipedes and centipedes dragged their armored lengths through the leaf-mould and fern-shadow. The land hummed, clicked, and rustled with exoskeletal dominion. This was the age when arthropods reached their greatest majesty and terror, and the world belonged as much to chitin and mandible as to root and leaf.
The swamps were no less fertile for larger life. Amphibians flourished in the drowned forests, growing heavy-bodied and formidable in the warm shallows and reed-choked channels. Some ruled the mud and river edge as patient hunters, while others pushed farther inland through the steaming growth. Later in the age, the first true reptiles arose, less bound to the breeding waters that had birthed their amphibian forebears. In their coming, a new pattern of life began, one better fitted to the harsher and drier worlds yet to come.
Mythic powers also marked this age. Around 350 million years ago, cataclysm upheaved the world and raised new lands from the sea, among them Ponape and dread R’lyeh. Upon these newly risen places came Cthulhu and his kin from Xoth, claiming cyclopean territories beneath alien stars. The Elder Things warred against them, yet no final triumph was won, and in time an uneasy division of the world was made. The Deep Ones entered the service of Cthulhu and helped raise the dead city of R’lyeh, while legend places the foundation of K’n-yan in this age beneath the earth. Thus the Carboniferous world was not only a realm of swamp and insect, but of eldritch settlement, buried pacts, and powers too vast for later mortal memory.
Nor were the gods absent. Yig, Father of Serpents, is held in many traditions to have guided or quickened the first reptilian lines, setting his mark upon scaled life as it emerged from the older amphibian world. In the greatest forests, elder treants and primordial tree-spirits were said to keep watch over green immensities older than many later mountains and kingdoms.
Yet the age did not endure in unbroken luxuriance. Its own abundance carried the seed of change. Forests transformed the air, climates shifted, and the warm wet world began to break apart. Rainforests shrank, swamps withdrew, and colder conditions spread across the earth. Fire grew more fearsome in the oxygen-rich air, and later glaciation advanced across great regions of the world. Though no single destruction ended the age at once, many of its giant dominions failed as the old swamp world fragmented.
Even so, the Age of Bugs left a deep inheritance. It filled the world with vast forests, raised arthropods to monstrous greatness, and carried amphibian life toward the first reptiles. It also left drowned cities, serpent-marked bloodlines, and buried memories of Cthulhu’s reign beneath the waves. The next age would inherit a world richer, stranger, and more divided than the one before it.
Eon XXXI – The Age of Amphibians (Permian)

Age of Amphibians
The Drying Crown
“Amphibians rule the land, and the seas become the domain of strange, armored creatures.”
Eon XXXI was an age of widening contrast. The endless swamp dominions of earlier worlds had begun to break apart, giving way to a harsher and more varied earth. Across the great body of Pangaea, climates divided into wet deltas, river-fed lowlands, dry interiors, upland scrub, and glacial margins far to the south. The old wet world had not vanished, but it no longer ruled without challenge. It survived in marsh basins, floodplains, and steaming lagoons, where amphibian life still held its greatest power.
In those wet places, amphibians were the lords of the age. Colossal croakers, salamander-titans, and broad-skulled river hunters lay half-submerged in reed-choked channels and mud-dark pools, then burst forth with shocking force. Their calls rolled across the wetlands in deep territorial choruses, and their leathery hides and massive limbs made them masters of the marsh edge. Every shoreline, oxbow, and drowned forest seemed alive with them. This was the last great flourishing of creatures still bound in blood and breeding to water, yet mighty enough to rule the land around it.
But the Permian did not belong to amphibians alone. As the world dried and the old swamp abundance retreated, new lords rose upon the land. Synapsids, the mammal-line ancestors, spread across the supercontinent in forms both formidable and strange. Sail-backed predators such as Dimetrodon hunted the lowlands, while later beast-lords and tusked herbivores ranged across broader and harsher country. In them appeared a new pattern of terrestrial life: tougher, more varied, and less dependent upon the waters that had cradled earlier ages. Alongside them the first true reptiles gained ground in the drier uplands, carrying leathery eggs and scaled resilience into lands where amphibians faltered.
This was also the age in which the Serpent People rose and founded Valusia. Around 275 million years ago, in elder reckonings, they established one of the first great kingdoms of cunning, ritual, and cold-blooded sovereignty. Their dominion belonged not to the swamp alone but to the older, hotter earth of stone halls, hidden temples, and dynasties coiled around ancient secrets. In later ages their greatness would be half forgotten and half feared, yet in the Permian they stood among the true powers of the world.
The seas were no gentler than the land. Strange marine predators cut through Panthalassic waters, among them bizarre shark-kind such as Helicoprion, whose terrible whorled jaws made the oceans a place of alien violence. Other ancient lineages, armored, toothed, and monstrous, contested reef, shelf, and deep in ecosystems already strained by long change. The maritime world still bred horrors in abundance, but its foundations had begun to fail.
At last weakness became catastrophe. Toward the end of the age, the world entered the Great Dying. Volcanic ruin, poisoned air, extreme heat, and failing oceans combined in the most terrible extinction the earth had yet endured. Waters lost their breath. Marine life perished in almost unimaginable numbers. Forests withered, food chains broke, and the land itself seemed to sicken. Whole dynasties of life vanished. Even insects, so often spared by lesser crises, were struck down. The ancient order of the world was shattered.
Thus the Age of Amphibians ended in devastation. Its marsh-kings, serpent realms, beast-lords, and sea horrors were broken together in one vast ruin. Yet not all perished. A few hardier lines endured the dying world, and from those survivors the next age would be painfully rebuilt. What followed inherited not the fullness of Permian life, but the ashes of its greatness.
Eon XXXII – The Rise of the Dinosaurs (Triassic)

The World After Ruin
“From the ashes of the Great Dying, reptiles rise, the first dinosaurs take their swift steps, and mammals are born in shadow.”
Eon XXXII opened in the long aftermath of catastrophe. The Great Dying had broken the old order of the world, leaving the earth hot, dry, and grievously diminished. Across the vast body of Pangaea, deserts spread through the continental interiors, forests were sparse, and life clung to river corridors, lake margins, coasts, and the few greener reaches where recovery could begin. The world was not yet rich again. It was a harsh and wounded earth struggling back from near-annihilation.
The earliest Triassic was an age of survival rather than abundance. A few hardier lines endured where so many others had vanished. Lystrosaurus and other survivors of the dying world spread across the broken land, while proterosuchids and other crocodile-shaped hunters became among the first great predators of the new age. Conifers and other seed-bearing plants slowly reclaimed the wastes, and over long ages the barren world began to green once more.
From that slow recovery rose the archosaurs, the great reptilian stock from which much of the age’s power would descend. They spread into the empty niches left by extinction, diversifying into swift runners, ambush hunters, armored herbivores, and forms that foreshadowed the greater reptilian empires to come. Among them, in the later Triassic, appeared the first true dinosaurs: small, fast, alert creatures such as Eoraptor and Herrerasaurus, not yet the unquestioned lords of the world but already marked by deadly promise. They found their opening in a changing earth and began the ascent that would define the ages ahead.
The seas also recovered, though more slowly. Reefs returned, marine food chains rebuilt themselves, and the waters welcomed new reptilian powers. Ichthyosaurs cut through the oceans like living spears, while other marine hunters reclaimed coasts and deeper channels once stripped nearly bare by extinction. Above shore and cliff, the first pterosaurs took the air, their leathery wings opening a dominion no beast had held before.
Yet the Triassic was not only the age of reptilian ascent. In the shadows beneath that rising order, the first mammals appeared. Small, furtive, warm-blooded, and easily overlooked beside the greater reptiles, they were creatures of burrow, underbrush, and night. Though slight by outward measure, they marked the beginning of another great line, one that would endure while grander powers fell.
Older histories also shifted in this age. Around 250 million years ago, the shoggoths rebelled against the Elder Things and were cast down, a sign that even the eldest makers of life no longer ruled an obedient world. In the early Mesozoic, Atlach-Nacha held dominion over its arachnid children in hidden places beyond mortal kingdoms. Between roughly 250 and 200 million years ago, the city of G’harne stood among the elder works of the age, while around the middle Triassic the stone tablets later known as the Celaeno Fragments were first inscribed beneath Triassic skies. Around 225 million years ago, ecological disaster shattered what remained of the Serpent People’s civilization and drove many of their kind into hiding beneath the earth. These were not the ruling powers of the surface world, but they remained part of its hidden inheritance.
The age did not end gently. Near its close, another great extinction struck. Many reptilian rivals of the dinosaurs perished, ecosystems were broken again, and the balance of the world shifted sharply. When Eon XXXII ended, the dinosaurs had not merely appeared; they had been given their dominion. The next age would belong to them more fully.
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