Concerns regarding Underverse & the questline

[Roger Smith]

This just occurred to me recently, but...
Considering our nature as Primes (and the words spoken by Omni in his first big reveal), couldn't we just [spoiler]make a way out ourselves, given enough OM?[/spoiler]

1. Your character doesn't know that
2. Diablo was only able to do that cause he's one of the biggest and baddest Primes in the Omniverse

Edit: Also letting out people from the Underverse is a bad idea

In an addendum to this, there is this to keep in mind, from the "What to do after you've joined" topic:

Try to make a mount or vehicle
It works! Though it can never seem to get beyond about 80mph. It takes about five minutes.
Try to make new clothes
It works! Though it takes at least three minutes.
Try to heal
It works, although very slowly. Resting normally achieves the same effect.
Try to open a portal
It seems like it would take reserves of omnilium far beyond what you currently have.

That said, making a portal or a way out of the Underverse, with enough OM, would be POSSIBLE. But no one on this site, as far as player characters go, would have anywhere near enough OM to do so.