Spoilered for NieR and Drakengard.
So, aether flows different through the shards right? As in, there's little to nothing in the Void, there's the most on the Source, and while not aetherless there's considerably less on the First. This means there could be a shard with so little that people cannot wield magics very strongly, right? What if, in the case of Drakengard (and DoD3) to NieR...
What if there's a shard akin to our own Earth. Not Earth, but similar and magitek rules. This world relies mostly on technology. And considering Ending E of Drakengard, I wonder if during the Shard's destruction (as in where Caim and Angelus came from), the same thing could have happened, which lead to NieR Replicant/Gestalt. A portal was opened from that shard to the one in which tech rules. WCS still happened, NieR Replicant/Gestalt happened which lead to Automata. And given how Accord can zip between timelines and dimensions, this android technology could have ended up with winding up on the First in an attempt to save humanity.