A YJA Moment - The All-Spark

The beginning of the history of the Transformers lies with the Quintessons, a cybernetic race of aliens which operated as vassals of the great Infinite Empire.  In the time before their development of their Starforges, the Rakatan were reliant on a number of client species, of which the Quintessons were but a part.  They developed armies of robotic servants which mined heavy minerals and crafted them into finished goods for the Empire's voracious appetites.  These robots ranged in awareness, with the Prime Coordinators being the most intelligent.  None of the robots were considered sapient.

In one of the worlds, a Prime Coordinator stumbled through a natural rift to what later would be revealed to the Underworld. Utilizing survival routines, they began to explore the area in order to find a way back to his mining unit.  Instead, he discovered an abandoned tomb within a glowing gem that seemingly called out to him.  Touching the gem, it was suddenly flooded with knowledge and self-awareness, becoming a sentient robot being.  No longer was it a Prime Coordinator, but the first of a brand new species.  He was now Primus, imbued with the seemingly-endless spiritual reservoir called the All-Spark.

He made his way back to the living world and granted souls, known as Sparks, to his fellow automatons.  This created the first of what would be known as Transformers.  Primus traveled across Quintesson space, granting self-awareness to every robot he could find.  When the Quintessons intervened, his followers took up arms against them and freed themselves from the yoke of slavery.  The last act of their former masters was to turn one of the Warworlds of Cybertron against them, but the attack ended when Primus gave it a Spark, creating Unicron.  Unicorn destroyed the last of the Quintesson armada but turned his back on the rest of the Transformers to travel to worlds unknown.

In order to facilitate the future of his species, Primus traveled to the deepest layers of Cybertron, where he merged with the central processing centers.  This created the Well of the All-Spark, the heart of the planet where all-new Transformers protoforms receive their souls.  In terms of Transformer religious belief, Primus is the closest thing that the Cybertronians have to a god, and they give reverence to him for the foundation of their entire species.