Long ago during The ending of The golden age and into the age of primes fresh after unicron defeat and with that primus sacrificed himself to become the planet core but The intense wave of energy from the clash transformed in your nearby I standards into a massive hulking cybertronians The original 24 cybertronian knights in the early days of The age of primes.
They served as guardians Does important relics begin to be discovered or uncovered and relics in the making held untold power And suddenly the jobs shifted from being the guardians of cybertron to relic keepers Hidden away in a place only the knight's knew of and when the disciples of unicron empowered by the Quintesson(s) Waged war on cybertron kind the knight's headed the call their battle lasted an entire cycle(24 hours) No matter how many brothers and sisters They lost the knights continue to hold out.
During one cyber cycle the knights Great with a surprise attack only three of them remained well the other two held the gate with their lives the remaining knight went into the Secret chamber and shattered the knight enigma and buried one of the pieces into it cog and send the 2 other pieces on Exodus along with all the other relics while hiding another piece on Cybertron as unicron dark disciples and the Quintesson walk through the defenses The farmer security measures activated as the support pillars exploded whoever was in relic chambers At the time card in the explosion in buried in a cybertronian cave system.
With the knights gone and majority of the relics lost to the star's cybertron moved on and slowly but surely the cybertronian knights were forgotten but not all of them died in the extinction some went on colonization missions beforehand to a place called "earth" but when they never returned it was made clear the knights were no more but Within the well of sparks and the knights tomb wait for a cybertronian worthy to become the next guardian knight.
15,000 cyber-years later The chance just might come around