Concerns regarding Underverse & the questline

[Undyne]

I'm not arguing with anyone, and I have my own opinions relating to the questline.

What I think might be worth considering is that Diablo made the Underverse. If there is an actual exit somewhere, do you really think he's just going to let Public Enemy Number 1 have access to it? ( I mean, there's a reason why there isn't a Void Gate quest in Coruscant or Camelot.)

Honestly, I'm pretty sure that if Tyrael knew of a physical exit, he'd do anything in his power to destroy it. This is the same guy who sacrificed his powers and relegated himself to eternal suffering at the hands of his rival to ensure he was trapped in the Underverse.

Physical or Void exits would obviously need some sort of reasoning as to why they exist and why they're not closed. But something like a physical exit guarded by a very powerful demon could exist with Diablo's knowledge because he can't send his subordinates out for any reason, and believes that the guardian he has put there would be sufficient to prevent Primes from leaving. Tyreal could be unable to close it due to not being strong enough to confront the demon there.

I'll admit though that it'd be a difficult thing to balance.