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I offer my excellent negotiating skills (diplomacy and intimidate), clerical powers and my status as a member of the Asmodean Church, which should come in handy in Egorian and other parts of the world where Cheliax holds sway and beyond. I also believe in research.
You can trust me because it is a matter of religious dogma that the sanctity of contracts must be maintained.
If you allow me in your organization, then we shall go very far. And I assure you: Asmodean clerics do not stay at the bottom for too long.
Answer to Q4, see Answer to Q2.
Answer to Q5, I wait for the maid to go out before invoking a spell to take on the likeness of the maid. I then offer the target some wine which I have laced with slow acting poison. After I confirm the target has drank the brew, I immediately leave the scene.
Other solutions are possible depending on whatever data prior research may turn up.