A Spark Half on Loan

Shockwave has fought in the darkness for eons. Longer, in fact, than many races have existed. He has outlasted even ideologies that lasted as long as some species' existence. Now, in the darkness of exile, what waits for him? Peace at last, or war? Freedom, or subjugation? (Set in the IDW comics, Fanfic/AO3 does weird sorting for TF)