Disclaimer: Mass effect belongs to Bioware and Orion's arm belongs to the Orion's arms universe project.
Prologue: The importance of a single event.
One event can change everything. It doesn't matter whether it is a large event or a small event nor does it matter whether it is a natural event or created by personal choice. For if an event were to contact on any society it will cause small ripples which may give the correct time, place, a event causes waves throughout society. For whenever something happens it changes society, it changes people.
In 2150 near the planet Klendagon within the century system in the Hawking Eta cluster, an event happened pulling a being from one universe to another. This being in time will change the entire galaxy and indeed the course of history itself. This being's name is Hephaestus: A basic transapient from the Keter dominion with a combination of beliefs of Keterism and MPA materialism. In time he will reveal himself and a project that will change the galaxy forever.
But that is in the future; this story is how he got there. How he developed into a hidden superpower, how he brought peace and stability to the terminus systems, how when the time was right revealed to the galaxy what can be truly accomplished if the right technology is deployed to the fullest extent. And with the technology show the galaxy of the potential power of the philosophy of transhumanism and of original technology.
True he may be brutal both in honesty and of those he believe deserves it. He is also abrasive, cold, and some even call him strange. But however no one can deny what he had done. At the same time he will make enemies among some powerful people for he is a destabilizer of the pecking-order of the galaxy which they directly benefit. As a result they try to discredit him, destroy him, kill him, and in the end try to justify themselves to the general public. You shall see whether or not they will be successful.
But that is in the future for now we shall see how he originally went from his universe to the universe which the Citadel Council and Element Zero exists. Our story begins in orbit of a xeno-artifact The Hedrile in the solar dominion in the year 10950 A.T. Our Transapient Hephaestus, after centuries of planning and of struggles, is now waiting in orbit around The Hedrile. He is awaiting permission of the Solar Dominion Archailect, The Lord of Rays to go into The Hedrile. For the beginning is critical for the rest of the story.