*Spoiler*
Try doing the quest for the temple of helm, where you need to gain the services of an artist. You can 'get' the Illithium from a friendly serial killer. If you want to keep it for yourself, you can give Sir Sales (if that was his name) the fake Illithium.
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The last arrow of Legolas kindled in the air as it flew,
and plunged burning into the heart of a great wolf-chieftain.
All the others fled. -J.R.R. Tolkien, The Lord of the Rings
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