@mikasslime has a very fun AU where Orion and Sentinel fall into the well together, one dead and one dying, and Primus smashes them into one, singular, combined Prime (in body and mind both; they function as a combiner that can't be separated because their components would just. die) because that was the only way to save them both, to a given degree of saving...
They definitely have an official name that's not silly at all and fitting for the kind of existential and body horror going on with that entire concept, but we've been calling them "Remix Prime", because it's too funny not to.
There's also a very fun fic about them that you should definitely read.















