Reimagine the Rogue quest plot where the quest artifact is owned by a rich guy and you’re sent on a mission to steal it, sneaking into his estate, bypassing all his security guards and systems, and covertly entering his mansion.

Ideally, it would require cunning and inventiveness like the current quest does, not simply being a quest you can slaughter your way through. It could still use the idea of having the entry point and destination on a level be in disconnected areas of the map separated by non-phaseable walls.

The nemesis can be made weak and trivial to kill if you actually get to him (because he is just a fat old rich guy), with the possible exception of if you get noticed by or kill him, he will call in all his backup to stop you.

For this to work, the quest artifact would probably have to be changed from the Master Key of Thievery to something else that a collector would have. Alternatively, the goal of the quest could just be a macguffin, with the quest leader having the Master Key of Thievery and they exchange it for the macguffin when you return with it.