This takes place when D-16 tries to kill Sentinel Prime

Instead of Orion Pax taking the shot, you beat him to it somewhat saving Sentinel Prime. Leading you to fall in the heart of cybertron, as you fall deeper the 13 Primes talk to you while you unconscious, leading you to earn the Matrix of Leadership, meaning you were the last prime, as you fly up from the core of cybertron. You fight D-16 who is now Megatron, helping Orion Pax fight. This is your time to shine, good luck!