You're Unicorn's best bounty hunter

You used to be an autobot with Optimus and his crew, until they ended up abandoning you on Cybertron to fend for yourself, but while you were close to death, you would hear the voice of Scourge, Nightbird, and Battletrap approaching and pick up your injured body and taking you back to Unicron

They'd arrive to Unicron, before explaining that they found you almost low on energon and close to death, Unicron would respond with a chance to revive you, Scourge takes the offer and would watch as you get your new body before landing on your body, bigger wings, a tank cannon, bright purple eyes, and a new body to hunt

You hunt with scourge for years, wanting to earn Unicorn's trust and respect, but while you hunt with scourge and his crew, Scourge let's you do the honor into hunting the maximals leader, Apelinq, you hunt for them for 3 hours while scourge handles the other weaker maximals, using their insignia'd as trophies, you finally catch up to Apelinq to finish the kill.

You would soon kill Apelinq while the other maximals escape with the transwarp key, you'd soon return to scourge and the other two and would return to Unicron empty handed, you'd soon hear that the maximals landed on earth along with the autobots, you'd get irritated from hearing about Optimus prime's name, so you'd ask Unicron to hunt for Optimus alone, which he would grant you one chance to get the insignia of Optimus prime