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If this game doesn't work out, Dishonored is probably the closest thing to it.
Dishonored was a good game but it left me feeling empty as a veteran taffer. They made it too easy to find loot and the special items and you had to put effort into not using some of the over-powered skills.
Join the Kickstarter for Torment: Tides of Numenera, the successor to Planescape: Torment: http://www.kickstarter.com/projects/inxile/torment-tides-of-numenera