A spell I'd be absolutely confident could hold him doesn't exist.

[ Besides Jack, the only thing he's ever met with more power than God is perhaps the Singularity, and that's debatable. It's able to toy with archangels, and one would assume, if Chuck were brought here, that might mean the Singularity can manipulate even him. But there's no knowing for certain. There can't be. ]

Formidable as the Singularity is, do you imagine it could overpower him?