You are to enter the location unseen and unheard. The enclosed scroll is a modified enchantment derivative of the spell Invisibility Sphere. During the operation, one wizard is to remain in vaporous form and at least five paces away from the other two members of the company at all times unless one or both require immediate assistance.
Once inside, you are to make your way to the first basement level. At that level, there is one large hall identifiable by its two arched doorways, although neither frame has a door hung in it. These two doorways are the only entry points to the hall. The doorway which is to be the target of the operation is the one on the right-hand side, when viewed whilst standing within.
You are to silently and non-lethally incapacitate any individuals within the room. You are to dispel all magical effects within fifteen feet of the target doorway. The cleric among you is to cast Greater Exorcise centered upon the door's arch.
A wizard among you will then cast Gate Seal of the sixth order on the doorway. The caster will be asked to report on whether the spell took hold as might be expected of a lesser portal of Sigil.
You are then to pass a thin wire or enchanted cutting blade through the edges of the door frame in at least five places, severing a full and unbroken material frame with outward strokes that penetrate at least two inches into the stonework. After completing this step, each wizard is to cast Warp Sense and record the results.
Secondly, within a low wall cupboard near the left doorway, the one opposite your previous target, the rear panel has an irregular whorl or knot that will glow under Arcane Sight. That is an enchantment that should have two visible and unbroken strands of steady force emanating from it. As a requirement of your mission, you are each to report whether you witnessed two unbroken strands emanating from the wood knot within the cupboard. Do not make your observation until after Gate Seal has been cast.
If at any time a spirit appears, you are to dispatch it as silently as you can. Destroying it takes precedence over any other action to be performed. If you find yourself choosing between failing your objective of remaining undetected and failing your objective of destroying the spirit, you are to prefer destroying the spirit.
After these tasks are complete, you are to exit the premises. At dawn you are to meet in the park directly outside of this tavern where you will testify to me and a court magician under Zone of Truth concerning the outcome of your mission prior to receiving payment.