1. No super advanced technology.
2. Nothing inhumane.
3. Can't be to expensive. So you can't have solid adamantium walls.
Cool challenge
A magical solution could be possible, sending prisoners to the land of the dead through many of the portals that currently exist around the world
Limbo, hell, heaven, But there would be only one possible area where the living super villains could go where they would not be treated inhumanely
Something like The heaven of hero's created by Captain Marvel in the Universe X afterlife,
Reasons
1(Magical prison because to many super villains have specialties in technology)
2(the prison being centered in the after life to prevent people getting there to create break outs,)
3( the super villains would still be alive & very vulnerable there)
4(It would give the dead super heroes something to do in-between quaffing)
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