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The ring, if I'm not mistaken, is in the crypt to the north, near the main portal; water elementals should appear slightly above the meadery when you approach it; kill them, and the quest will be completed. I might be wrong, as it's been a while since I played. As for the campaign, yes, it's simply brilliant. You can try the author's recently released campaign for Inferno; there aren't as many quests there, but there's more hardcore gameplay than in this one!
Added 1 minute ago
By the way, I finished "Son of the Devil" - it was great; I was disappointed that I didn't kill the Devil in the finale, but then I found out that the endings are the same. The campaign is brilliant; I think everyone will agree. MasteR, WHEN WILL THE SEQUEL BE RELEASED? I want more campaigns like this!
Added 2 minutes ago
Aaa... I already found it :) I'll be playing it today.