Delja opens the door to find a bedroom. It is a dimly lit, comfortable room with a low ceiling. An ornate four-poster bed sits against the wall, with no evidence it was ever used. Flanking the room are two small reading alcoves, within half-full bookshelves with decorative paraphernalia filling the gaps. The books are memoirs and journals, and the paraphernalia various minerals and art objects collected from across the planes.

After a careful scan, Delja notices a notebook tucked under the covers of the bed. She can barely make out "SHIPPING" in the part of the title that is visible.

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Ux opens the door to find an almost-empty storage chamber. Shelves that once stored mundane equipment, rations, and trade goods form lanes across the chamber. Only a small fraction of what was once there remain: ink, parchment, chalk, spyglasses, notebooks, folded linen, silk cords, candles, tea leaves, iron pots, and spell component pouches.

It is dark and musty. This room has not been visited in some time.

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Myriad considers. She is not quite sure she grasps the principles of arcana running the artificial magic sphere before her, but there is a curious lack of the normal tells of evil or affliction or energy drain associated with the strong energy of necromancy which permeates it. Standard theory suggests that this ties into the other face of necromancy, namely its role in the manipulation of soul. (As many talented necromancers would complain, the field has been misjudged due to its poor name and connotations of raising the dead, whereas its true purpose is the study the soul. An argument many laymen find uncompelling due to the absurd prevalence of the walking dead.)

There is planar power here. Though the Lady of Pain prevents the creation of portals that leave Sigil proper, nothing prevents a talented mage from conjuring a pocket plane contained within the cosmic topology of the City of Doors, and whatever the sphere is it carries the cadence of that magic.

And like many things of planar power there is a key that accesses them, whether a literal object, the presence of a person, or a spoken word.