MidGard
But once he moves on to his next bloodline he won’t be able to use the domain either way right? If he keeps immunity, which he’ll likely need to keep I redacting with Nimo, he won’t have the domain. If he keeps the domain he won’t have the immunity. If he didn’t need the immunity he’d still need the ability to extract energy from the void, or the ability to open portals to the void. Maybe he could integrate Khaos’ bloodline again for his very last replacement so that he possesses the full set of abilities? Or maybe khaos could somehow grant him void manipulation