Silvanus

The Celtic and Faerunian power of wild nature, standing in contrast to the more ordered, agrarian nature represented by the goddess Chauntea. Typical of nature deities, some described Silvanus as being wild and unpredictable, much like nature itself. He was chiefly concerned with nature itself, specifically wild nature, in both its natural beauty and fierce savagery. Caring very little for maintaining a proper balance with civilization, being wrathful towards those who threaten wild places. He paid no attention to the machinations of mortals or other deities. When it came to nature itself, he cared greatly for maintaining a balance between growth and decay, water and drought, fire and ice — the natural cycle of life. This was considered to be his dogma and he was emotionally distant in regards to its necessity. This led some to view him as heartless, though in reality he valued all life.
He had a special hatred for those who used fire carelessly or with deliberate intention to cause destruction.

His avatar was capable of controlling any number of animals and forest creatures with the sound of his voice. He could also make plants grow or shrink at any rate he willed. Both of his avatar forms could cast spells from any sphere or school of magic. The Old Father form would cast spells from the animal, plant, and weather spheres at triple their normal effect, while for his Young Strider form this only occurred for spells of the weather sphere. In addition, the Old Father avatar form of Silvanus could create and animate both plants and fungi, imitating similar spells from any sphere or school of magic. He could shrink or enlarge animals, summon animals to his aid, and command loyalty from any mundane animal, giant animal, or sylvan creature. Even turning animals against their owners. He frequently summoned treants to his aid.
The Horned Hunter could also cast some spells, most notably telekinesis far beyond the normal weight limits, and only spoke to other creatures by a telepathic means.
The divine realm of Silvanus varied depending upon the cosmology that one used. In the Great Wheel cosmology, it resided in the Celtic pantheon's realm of Tir na Og. It stood in the deepest reaches of that realm, going by the name of Summeroak or Deep Forest. According to the World Tree cosmology, the realm was located in the neutral plane known as the House of Nature. And finally, the World Axis cosmology placed his realm within the Deep Wilds.
Silvanus did not have many allies, nor did he have many enemies. In the Faerûnian pantheon he was allied with and served by fellow non-evil deities of animals and nature. Such as Eldath, Mielikki, and Shiallia. The first viewed him as a father figure, but often found his robustness intimidating, while the second had crafted the banish blight spell partially as a gift to him.
Other allies of Silvanus included Chauntea and Lathander — who he at times he would work with in their efforts against the Gods of Fury. As well as Ki, nature goddess of the Untheric pantheon.
He was considered an enemy by Moander, Malar, Talona, and Talos. He actively opposed the latter three, as their love for destruction often upset the balance of nature.
Silvanus had both clerics and druids in his faith, though their presence varied by location, with druids being the more prominent due to his narrow focus on wild nature without concern for balance. One could even find halfling druids revering him over their own pantheon's nature deity, though this was a rare occurrence. Some barbarians, hermits, wilderness dwellers, and rangers also worshiped him. His clergy often worked together with the clergy of his allies, Mielikki and Eldath, towards common goals. With the latter two being instructed to support, protect, and (if the need arose) obey the clergy of Silvanus. These included protecting the wilderness from further encroachment by civilization, such as the felling of trees and limiting farms or ranches to already cleared land. Also the fighting of diseases, planting new plants, and fighting those who did the bidding of Malar.
His worship was widespread across the east and south of Tethyr, especially in the Forest of Tethir,n the Dalelands, the Moonshae Isles, the Chondalwood of the Vilhon Reach, and the Yuirwood in Aglarond.
Silvanus originated as a member of the Celtic pantheon. Around the time of the rise of Netheril, a wave of planar immigrants came from another world and settled on Toril. One of these groups of people came from a rugged land with a culture tied to nature, the sea, and the warrior history of its dozen-king greater god. They brought along with them their own style of society and faiths, the worship of Celtic deities, such as Silvanus. As was a common practice in the Celtic pantheon whenever it established itself on a world, Silvanus would go on to join one of the local pantheons, seeing as he was being pushed out of power in his own.
Some myths claimed that Silvanus had fathered the goddess Mielikki with the goddess Hanali Celanil. This legend sprung off from a desire by some to explain why Mielikki's worshipers were giving her the honorific "Daughter of Silvanus," which had originally come about due to her close alliance with Silvanus.