Interesting concept, I had an Idea for this kind of cross over once If I can sugest something to help this tie in?: The Reapers were Unicron's last ditch efforts after he saw Primus create the 13 Original Primes before he fell into his slumber and became the Core of the Earth.
Author's response
Thanks for the review (Sorry for the....quite late reply :( ) I am glad you like it.
I hope you enjoy the rest of the story. :)