Those loyal to Sakinnirot say it was the first child of the
Dragon Below. In many ways, it embodies pure hatred—
not the savage bloodlust of Rak Tulkhesh, but hatred that
smolders and burns. It thrives on bloody feuds that only
deepen the need for revenge, on physical and spiritual
wounds left to fester. It’s possible Sakinnirot is nothing
less than the patient fury of Khyber itself, the determination for vengeance on the world that holds it prisoner.
Whatever the truth, Sakinnirot is one of the most powerful overlords; during the Age of Demons, the Scar laid claim to all of Xen’drik and reveled in battling other overlords. It was bound even more tightly than most overlords, and few of its fiendish servants escaped into the world; both because of this and its feuds with other overlords, the Scar That Abides isn’t represented within the Lords of Dust. However, the rakshasa Lorishto—an ak’chazar of Eldrantulku—has been seeking to weaken the binding of Sakinnirot, hoping to become the prakhutu of the Scar That Abides.
Source: Chronicles of Eberron
One of the greatest secrets of Stormreach is also among its very oldest. Over one hundred thousand years ago, Xen’drik was home to an entity of incredible power and hate, one of a group of godlike beings called the Na-Vakhti—creatures known to the mortal world as the rajahs of the rakshasa race. (The true name for this ancient evil is an expression in the rakshasa dialect of Infernal that translates roughly to “Overlords.”) Territorial even by demonic standards, this Overlord laid claim to Xen’drik, demanding obeisance even from others of its kind. The entity’s name was Sakinnirot, and like its sibling Overlords, its rule ended when the pure force of the newly kindled Silver Flame bound it.
A new, dark age for Xen’drik followed the end of the Age of Demons. The giants who rose to prominence eventually made their way to the northern reaches of their island home. There they founded a new city built along the equator—Sakinnirot’s former domain—on top of the desolate ancient city and quickly claimed the ruins for their own. They scoured the ruins, and in the dust among the stones, they unearthed crude records drawn on crumbling walls and etched into broken tablets. From this lore, the giants learned of their new home as it used to be: a city of slaves who toiled at the whim of powerful overlords—who made them prosper—and found inspiration in it. The giant civilization began to grow, in part with the aid of what they uncovered in the ruins, and as it did, the demon lord beneath their feet stirred.
The giants accomplished much in the age to follow, and Sakinnirot was the long shadow cast beneath their ever-rising star. Over the passage of millennia, some of the more erudite and spiritually sensitive among the city’s giants began to suspect something was wrong with their adopted home, but there was no achievement colossal enough to make the feeling go away, no incantation mighty enough to provide the answers they sought. When at last their seekings brought the destruction of their civilization down upon them, Sakinnirot was pleased—and strengthened—and it patiently awaited the arrival of the next civilization foolish enough to call its former charnel palace home. In a very real sense, Sakinnirot is Stormreach and vice versa, and the fate of the two has always been and shall remain inexorably intertwined.
In contrast to some of the other Overlords whose names are known to select scholars outside the cults of the Dragon Below and the Lords of Dust, the name of Sakinnirot is unknown outside the Lords of Dust, and even among fiends few will speak its name. This reticence is not due to any lack of power or influence on the part of the rajahs. In fact, the opposite is true, since Sakinnirot is so powerful that even its own cultists hesitate to speak its name aloud, let alone write it down for others to find. They say that every time a mortal speaks, reads, or writes the name of Sakinnirot, the dark force to which the name belongs grows restive.
Sakinnirot is bound, but its anger can reach beyond the walls of its prison, bringing misfortune to any who draw its attention. Cult doctrine holds that Sakinnirot will allow no mention of its name upon mortal lips until and unless it stands before them as the conquering god it knows itself to be. Only then, when the races of the Dragon Between lie bloody and cowed before it, will Sakinnirot abide the sound of its own name. Until then, it will be known only by the sobriquet used by its followers: “the Scar that Abides.”
Source: City of Stormreach