As the gods crafted mortals in their own image, so too did Aedric craft the beasts in his. The strongest of the gods had little use for words, so his children could not speak. He fought with his fists and teeth, and so too did his children rely on tooth, claw, and talon.
In time, Aedric's children came to hunt the humanoids crafted by the other gods. The crude spears they clutched did little to ward away the griffons, chimera, and other beasts Aedric had crafted. The other gods grew angry. Looking upon Aedric's creations, they crafted a mighty spell to undo their power.
Each of Aedric's creations were split asunder, their power scattered across their new forms. The soaring griffon yielded the eagle and the lion. The vicious ferreg gave rise to owls and bears. Hydras split into swarms of snakes, while perytons spawned deer and vultures. All of the most common creatures of the world so arose.
Few of Aedric's children escaped this scourge. Only the most common of them survived, and stories persist of truly terrible beasts that still lurk in forgotten corners of the world. Each and every last animal can trace its roots to Aedric's brood, and few can imagine what creatures they once formed.
For his part, Aedric swore revenge against the gods and their children. He threw himself into the sky and transformed into a swirling vortex of air to rend and tear the first cities to rubble. Before the gods could stop him, he become one with the cloudy, peaceful sky. Thus, the first storm ravaged the land. Since that day, Aedric appears again and again to punish the land, rising from the serene clouds to deal his punishment before fading again before his brethren can catch and punish him. Over the long years his wrath has faded, but at times it boils up again into a blizzard or hurricane.
Needless to say, the worship of Aedric is at best met with suspicion and fear if not outright persecution. As the lord of storms and beasts, he offers his worshippers protection from his wrath and the brute, physical power his creations embody. His clerics forswear metal armor and prefer simple cudgels, clubs, and maces to more sophisticated weapons. More tellingly, they refuse to bathe, cut their hair, or engage in similar trappings of civilized behavior. To the clerics of Aedric, embracing the way of the beast is key to achieving their god's inner mysteries.
In battle, the lesser priests can take on the forms of common beasts. The more powerful of his followers can adopt the forms of his true children, such as hydras and griffons. The highest ranking clerics conjure air elementals and take the form of terrible, living storms.
Aedric's clerics war against the other gods' mortal followers, though they can set aside their grudge if a greater threat presents itself. In particular, they view gnolls, manticores, and other abominations spawned by The Defiler as a heretical mockery of Aedric's creations.
Aedric's worship flourishes in the distant barbaric lands, far from the Realm of Ten Cities. Rumors persist of hidden cults that lurk in the cities, plotting to unleash a great invasion of beasts to overrun the civilized realm.