Well, there's two main ways to beat Watcher's Keep and it's either read Helm's scroll or defeat Demogorgon. If you read Odren's scroll, you'll get sealed in yes, but Demogorgan will open a portal so you can get out.
The better way to get experience is to beat Demogorgon (100,000), but the easier way is to just lock him in, well, the Improved Demogorgon anyway. (Read Helm's Scroll for 80,000 Exp. I think)
Hope this is what you were asking, and hope it helps.
Peace
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