The Nameless One

Naltyr, or as most of the world know him, the Nameless One, was once mortal with wit, talent, and a driven nature that led him to achieve all his life's goals and beyond, to be one of the first mortals that Daros and Linaria raised up to godhood. The other demigods greeted their new brother with open arms, and for a time they all worked together, helping and protecting their creations. Naltyr wanted to make them better, which at first started with gifting inspiration to his followers. Seeing what they achieved and also how the increasing worship of him made him stronger led him down a dark road. He began to encourage and push his followers to do and take what they wanted, to achieve any goal they could dream, even at the expense of others. Humans especially were susceptible to this as they were a newer race, not set in their ways yet, their societies and culture still growing. Soon he created entire races with these goals in mind, some perversions of other races such as the chromatic dragons, or entirely from scratch such as the orcs, goblins, and giants, though he found the more intelligent the creature he created the less likely they would be to blindly follow him.
Eventually he was confronted by his peers, demanding explanation, but due to surprise and the dramatic amount of power he gained from races and races of worshipers he attacked and killed several, taking their mantles of power into himself, becoming even more powerful, and marking the beginning of The War of the Gods. War raged for centuries, both on Lidoc and in the heavens, great armies were raised and fell, as battles on a scale unheard of were waged. In a climactic battle with Daros and Linaria were able to subdue and imprison Naltyr, although at the cost of their lives. They created an extraplanar prison to cut off his connection to the material plane, where he is chained and bound and kept in an eternal slumber. With their last act they also created the abyss and hell and banished the majority of Naltyr's armies there.
The remaining gods finished the war, killing those they could and banishing those they couldn't. Some fled of their own accord. Then they set about destroying all record of Naltyr. While he would still retain much of his power, eliminating his worshipers would diminish it as low as possible, making it as unlikely as possible for him to ever break free of his bonds. The gods used their power to break what influence Naltyr has over entire races, but the success was mixed. Some, like the Dark Elves chose seclusion and policed themselves, murdering nearly anyone that would attempt to defect. Others of his creations, like Orcs and giants received partial success, causing large factions whose influence to Naltyr has been completely severed. They were able to more easily remove the direct influence on races that he had no hand in creating, like Humans.

Worshipers

Those that know of Naltyr's true fate and name are mostly only his intelligent and devout worshipers, like Dark Elves. While goblins and many Orcs and giants still worship him, due to having more chaotic, violent, and impermanent societies, their knowledge of him is mostly held by their priests and shamans, and overall importance changes from tribe to tribe.
Of the goodly races, there are some small number of worshipers forming cults and secret societies. They have to be careful to keep a low profile as high priests and forces of other gods are always looking to quell any supporters they may find. Sometimes people, usually scholars of some manner or another, stumble upon Naltyr, though if it results in worshiping him depends on circumstance and the individual.
The largest group of Naltyr's worshipers is known as the Order of the Black Chains, a mix of various races that present themselves to the public as a sect of Phirulla, the Goddess of Death, sometimes seen as an extremist one, to recruit new members or just to hide in plain sight.

Rumors

Sometimes people will try and scare young children, or in dark times even adults may seriously begin to whisper, that the Nameless One isn't dead but just biding his time, but the clergy and temples are quick to dispel such silly notions.

Extremists and Cults

The Final Breath is considered a cult even by fellow worshipers of Naltyr due to their ideologies, methods, and zeal.

Divine Domains

Primary

Ambition

Death

Strength

Tempest

War

Zeal

Secondary

Arcana

Trickery

Divine Symbols & Sigils

His symbol is a sword extending from diagonally upward and left from a point, a lightning bolt extending from the same point up and to the right, and a skull directly below that center point, all 120 degrees apart, forming an inverse triangle.
The formal prayer to Naltyr is to kneel and prostrate yourself as though before him. The quicker, abbreviated motion is to look upwards, raising your head in order to expose your throat. Both are to show utmost subservience to Naltyr.

Colors

His primary color is jet black, with a dark, deep crimson secondary color.

Weapon

Naltyr wields either a greatsword, or will use a longsword in one hand while throwing powerful magics, usually lightning and fire, with the other. Followers of Naltyr do not generally pay homage to him by learning his favored weapons, his teachings instead tell them to learn and use whatever will give them the greatest advantage.

Tenets of Faith

Power is freedom.

Divine Goals & Aspirations

To free himself of his divine prison.

Destroyed Religion

During the First Age following the The War of the Gods, the surviving deities made a concerted effort to remove the very existence of Naltyr from the annals of history. Following the destruction of The Juthannan Civilization, there were no major traces of Naltyr left in the goodly societies. Naltyr is still worshiped by races and societies that have gone into seclusion, such as the Dark Elves, or cults, like Order of the Black Chains.
The upper echelon of the clergy of other gods know of Naltyr's true fate and oppose them whenever they find his supporters. Some, usually scholars, will inevitably stumble upon this information as well, usually greatly altering their destinies.

Divine Classification

God

Church/Cult

Order of the Black Chains