PROLOGUE: "What not to be seen..."
There is an rumor which true to one race: "The Gems". Its say that an rebellion leader of the Crystal Gem: "Rose Quartz" had shattered her diamond: "Pink Diamond". However to many that had seen the crime, there are some who knew the true: "The Cybertronian". The band of the lone Cybertronian lead by an Prime knew about what did happened on the her colony: "Earth". What really happened on Earth and Pink Diamond is that information is an lies. Its not Rose Quartz that started the rebellion, nor she shattered her diamonds. It just one Cybertronian that started the rebellion...
...The reason why that one did this, because what they did found on that rock is something important to them. So important that they refused to contract nor respond to both Homeworld and Cybertron. However, many of Gems and Cybertronians who came to Earth to see what they found, wanting to report it but Pink Diamond and her both loyal soldiers tell them that its belonged to no one from both planets, just the ancient god that the Gem used to worship and the Cybertronian that been build by it:
"Primus"
This so called "secret" drive one Cybertronian mad which that led to the civil war that cost both races to war, Pink Diamond shattering and blaming on Rose Quartz and the Crystal Gems. With this, the Galactic Council had enough with both of them and their civil war because they are causing more destruction on their controlled planets. They begin to do what they should done it an long time ago: "The destruction of both races".
This is the story of how this secret and one Cybertronian lead to the civil war. It begin long time ago when Pink Diamond received her first colony planet. With the handful of her courts and the band of Cybertronian who loyal to her, they already begin the colonization when they somehow found an tribe of organic who holding an map to something. So they report this to their diamond. She, Rose Quartz and an Cybertronian Major heading off to the village and find this map.