Cernunnos

Cernunnos is a Celtic deity... and that is actually as much as we know about him! No, seriously; Cernunnos survives only in various Celtic artistic depictions, which show a male figure with the horns of a stag, and a name on the Pillar of the Boatmen, a 1st century Gallo-Roman monument. Whilst figures like him appear throughout various Celtic splinters, no real information survives; from his surviving depictions, it has been theorized that he may have been a God of any or all of the following subjects: Animals, Nature, Life, Fertility, The Earth, Wealth, and the Underworld. In fact, so little information on the deity survives from the actual Celtic faiths that he is instead mostly known through the use of his name to identify the "Horned God" figure in various branches of Neopaganism, predominantly Wicca, where he is considered the God of Seasons and the Cycle of Life. He has also been named as one of the gods leading the Wild Hunt in some sources... but then, so too have Odin, Woden, and even his fellow Celtic god Arawn.

Dungeons & Dragons

Such is the obscurity of Cernunnos and the limited amount of information presented on him that Gygax left him out of both of the original Dungeons & Dragons sourcebooks on deities, with Cernunnos failing to appear in either OD&D's Book VII: Gods, Demi-gods and Heroes or Deities & Demigods for Advanced Dungeons & Dragons!

Deities evidently based on him appear later on in 1e, 3e and 4e, all three times in Dragon Magazine articles, but never under the name Cernunnos. He is instead called Cerunnos in 1e and 4e, and The Master of The Hunt in 3e.

Pathfinder

Cernunnos
Stag with Jeweled Antlers
Aliases	The Horned Lord, the Stag Lord
Alignment	Chaotic good
Divine Rank	Empyreal Lord
Pantheon	Golarion
Portfolio	Fertility, Seasons, Wild Animals
Domains	Animal, Chaos, Good, Plant Subdomains: Azata, Feather, Fur, Growth
Home Plane	Briarbough (Elysium)
Worshippers	Intelligent plant creatures/Animal kin, Good fey, Mortal druids/rangers, & Some elven fighters/rogues

In Pathfinder 1e, Cernunnos appeared in the splatbooks "Chronicles of the Righteous" and "Bestiary 4", the latter of which presented his physical stats. In the Great Beyond, Cernunnos is an Empyreal Lord of Azata stock. Known for his mercurial temperament, The Stag Lord aims to set right natural balances that are out of kilter and indulge in his passions. Cernunnos favors decisive action and, though he rarely makes a rash decision, he will sometimes let his anger overcome him and descend himself into Hell or the Abyss to exact revenge on demons and devils he has a personal vendetta for. Cernunnos is a wise and powerful Empyreal Lord and is thought to be almost a god.

Cernunnos was one of the first beings the Fey Lords created and he was the first one to leave the First World. When war comes to the outer planes Cernunnos is usually counseling action and decisive moves, while his counterpart, Korada, is usually counseling caution.

Cernunnos gets along well with most deities and demi-gods, but evil deities are treated with distrust. Cernunnos is a powerful supporter of Desna, as well as all of the other nature gods and most of the good gods too.

Cernunnos lives in Briarbough, a demi-plane connected to Elysium. It is filled with trees and bears a strong resemblance to the First World.

Cernunnos presents himself as a muscular elf with dull fur clothes that bear drawings of birds in flight or leaping animals.

The faithful of Cernunnos are mainly intelligent plant creatures or animal kin, good aligned fey, mortal Druids or Rangers, and some Elven Fighters or Rogues.

Darklands

Similar to Slaanesh, Kernunnos is a god of debauchery and hedonism. His largest contingent of followers are made up of Britons and Cornish who were cut off from their brethren by the invading Anglo-Saxons, and turned to him for aid. Warriors pledged to Kernunnos have abnormally large muscle growth and often go into battle without armor, or wearing nothing at all.