Hidden Temple.

Arakil stepped carefully through the underground gloom, fellow Prothen were nearby, searching the rocks and stalagmites for clues.  Clues left by the gods.  Arakil went around a particularly large and smooth stalagmite; and found a temple.  It was like a cave; a large portion of some great temple chamber within this bigger cavern.  Arakil crept inside, his green, pupilless eyes quickly adjusting to the thick blackness that shrouded the inside of the broken temple.  Sweeping dust from the wall with his robotic hand, he saw carvings and illustrations lying hidden under the layer of dust.  They were carved in a style he had seen before, five hundred years ago on Arung Khai.  The side-view, geometric style of the Architects.  Every line, every curve, every dot and feature was perfectly carved, perfectly measured.  Arakil excitedly swept more dust from the ancient wall and saw an interesting image; an illustration of the Architects themselves, hundreds of extremely detailed troops.  They wore advanced battle armor, with smooth, curved helmets with a single eye in the center, their weapons were long, broad rifles that, judging from the illustration, fired very potent energy rays.  A horde of monstrous horrors that Arakil realized were swarmlings, were rushing toward the Architect battalion.  He felt a creeping sensation along his metal spine.  Dashing past many other carvings of the Architects engineering worlds and spaceships, up to the back of the ancient temple; the altar.  The crystalline shrine laid on it's side, cracked, shards of crystal were strewn on the floor.  Above the altar was an image of an Architect wearing a flowing robe and crown-like helmet.  His hands were extended, gesturing to adjacent scenes; scenes of the Architects arriving in the Dagen Region, building a homeworld for themselves, finding primitive species, the Prothen and Notross, going to a barren, wasteland, world and finding... life.  They took this bold and resilient life-form and genetically enhanced it, they multiplied it, made it more adaptable than other species.  The things morphed and grew, in size and intelligence, the numberless creatures were then put under the control of an Architect-made being: the Overmind.  The swarms of these creatures grew evermore; until, one day, they turned and attacked their creators.  Overrunning most of the Architects' worlds instantly, there was a great battle at the Architect homeworld.  The Architects, after the battle, were no more.
Arakil, wide eyed, stumbled backwards.  The Architects had made the Swarm!