Transformers Prime: Reuniting

A problem has arisen on Cybertron or rather in. Primus's spark in fading into oblivion. Solus watches helplessly as the creator of the cybertronians die. Determined her body is restored and takes to looking for her brother who are scattered across the galaxy. Thing is she doesn't know where to look. Hopefully if she can find Alpha Trion first he'd have an idea where to look. Who better to ask than his bodyguard during the war and his prized student from before.

Set in Beast hunters but Optimus is his regular body.