Find your way to the top of the keep and speak to Odren.
No matter which dialog options you select, Odren and his company will go inside to see for themselves.
Unless you tell him The Imprisoned One let you out so you could lure them in. In that case, each party member receives 10,000 XP, the party earns one reputation point, and Odren & Co go on a pilgrimage. But you miss out on a ton of experience, so this is not recommended.
If Odren and his folk go inside the keep, a Ghostly Apparition appears and tells you the truth, that "The Imprisoned One" is Demogorgon, Prince of Demons. She offers you three options: To let Odren be slaughtered, in which case Demogorgon will be turned loose on Faerun; to go in and fight Demogorgon; or to read a new scroll which she gives you, which will seal Watcher's Keep forever. Accept the scroll for 25,000 XP per party member.
If you read the scroll, each party member receives 80,000 XP.
Or you can step back inside. At 1 you will find Demogorgon ... most hostile!
Demogorgon summons a couple of Marileths to his aid. Don't bother about them at first; if you kill them he'll just summon more. Concentrate on bringing down his defenses and finishing him off, then kill his friends.
For killing Demogorgon, each party member receives 100,000 XP.
Odren's friends will all be dead but you can have a final conversation with Odren before he dies. The party gets another 20,000 XP.
And no – once you leave Watcher's Keep again, you can't also score the experience for reading the Helm Scroll and re-sealing the keep.
Cheat: Well actually you can, if you are willing to cheat a bit. After killing Demogorgon, place the scroll in a quick item slot and leave the keep. Pause the game quickly after getting outside. The scroll will remain in your inventory a short while, so click it in the quick item slot to read the scroll, and you get the experience for reading the scroll on top of the experience for killing Demogorgon and speaking to Odren.
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