I noticed a hero who drank an Immortality potion doesn't get resurrected if killed by the Devour ability of a sea monster. Not sure about medusa gaze. Is this intentional.

I have the DVD complete version. v3.0. Readme says:
"Corrected aberrant results of heroes who have the Potion of Immortality or Guardian Angel on them, and are devoured by sea monsters."

So I assume this was bugged before and they fixed it by intentionally disallowing the hero to be raised? Or is this still bugged?

And I expect in some situations this would cause "aberrant" results. So they fixed it by disallowing resurrection when devoured.

Curious what those aberrant results were.

*shrug* My only guess would be something about a hero dying to damage and also getting devoured at the same time. But they should have considered that, since the same thing could happen to a creature. Maybe a double counter attack screwing up? I really don't know.

It seems to me what they meant by "aberrant" is that resurrection would be expected to require a body.

If the hero is devoured then I would assume there is no body. It's been digested, or is currently being digested in the stomach. Not much point resurrecting a body inside a stomach except to have yet another death.

If it's not working for petrified, then I would assume it's because it's become just a piece of rock.

I wouldn't say either way was a bug, I'd just assume some other remedy would be required for that condition, if any remedy exists at all. Personally, I wouldn't think of being completely eaten as a condition, and I wouldn't expect a remedy.

That's actually a good theory. I just wish they documented it better in this case. Instead what the readme says the could have written "Potion of Immortality or Guardian Angel no longer works when devoured by sea monsters". The way it's written now it's not clear what is the intended behaviour.

(Maybe adding that this is due to the fact that there would be no body).

Except a dead hero can still be taken to a town and revived that way. Perhaps gastric juices just rekill a devoured hero, and turning back to flesh after being shattered isn't very convenient for continuing to fight.

That brings up the question: how long does it take for a body to be fully digested? You could come back days or weeks later and still revive a devoure hero in a town. Unless sea monsters have a poorly functioning digestive system?

Maybe it just speaks to the revival skill of whoever does the reviving in town (in which case, why don't they revive creatures?).

Well I can confirm that Immortality seems to work normally against Medusa's gaze (i.e. you get resurrected).