The Four Truths are the cornerstone of the Old Tradition, for their disclosure ended any dispute about the beginning of the end, and the energies that now rule over reality. They were transcribed by Ezreal El, although there is no doubt, now, that some unknown entity led him in the transcription and named him the oracle of the death of the world.
First Truth
In the beginning was the Sempiternal, where solitary beings of neither form nor voice dwell. In the depth of their stasis, these beings shaped the cold darkness; motionless and aimless, they just existed because there we thought, sight, and nothing at all. Some of them radiated scorching heat and manifested through light and matter, while others lingered in the unknown as inherent segments of the void and of the darkness of these remote corners of Existence.
Second Truth
Eons went by, and sentience came to those supernal beings, and their endless reshaping taught them the origin of Existence and the change that was time itself. Then, in an undetermined moment, the first worlds, namely those containing tangible things and the incarnation of Existence, appeared. These shards of life were nothing compared to eternity. Only shining stars in the dim sea of the night, inhabited by primitive creatures. The most well-made of these worlds was the Material Plane. This physical world is what came to be known as Faerun.
Third Truth
Life came as a consequence of Existence in The Forgotten Realms, and with it came its cold and dark reflection: death. The first Echoes of Death came from a diaphanous mist and settled in a different plane, although connected to the Material by a fault in cosmic balance. This plane was the Plane of Death and the Shadowfell, where all that once was in Faerun becomes a shadow of itself.
The first entities of this dimension were spawn of the Deities, juvenile enough to inherit their craving for Existence. These cravings led them to pull the two realities together, separated by veils that dissolve when sleep sends the living to a dark dreamworld through which they observe a ravenous silence.
Fourth Truth
The oracle of the Fourth Truth announces an inevitable darkness on the World. Eventually, the dichotomy between Existence and Nothingness will fade: night will be eternal, and the Dark will merge with Faerun. The Echoes of Death will seize the throne of the Deities, transforming life into decay and madness. This age will last as long as death stands guard, because the void cannot exist without wholeness. Then, a new beginning, with only Sidir, as everlasting receptacle of Time and Existence.