Sharim

The small city where every magical item finds its way to eventually

Sharim is a small city, permanently riding the six winds governing the Plane of Air. The city's inhabitants are primarily mercanes, although a few mephits and invisible stalkers loyal to the mercanes have permanent residence there.

Sharim is known, though commonly believed to be a myth, to be the city with the highest amount of magical items per capita in the world. While mercanes are known to be traders of magical items, few know the truths of Sharim.

A great many libraries exist in Sharim. One for each type of magical item category. Each magical item that falls in the hands of mercanes is archived in these libraries. Items which are already catalogued go into banks for safekeeping until a sale of magical items is necessary. Whether mercanes hold one or hundreds of magical artifact is dependent on whether the item is commonly or uncommonly traded (and thus whether they may be asked to provide it for their customers).

Given the large number of magical items, Sharim is the city that every great interplanar thief dreams of and aspires to rob. This is why the city is constantly on the move, protected by a myriad of spells, and very, very hard to contact. However, anyone with access to a mercane's secret chest and a good enough proposition, could find a magical invitation to be teleported in and out of the city.

Mercane's Secret

What happens to all the items the mercanes don't catalogue, save up, or trade is unknown to all but the mercanes, and those who have attained high ranks in their society.
Mercanes require large amounts of power stored in magical items to procreate. Every item that is deemed "disposable" is used for procreation. Not all items are worth the same to a mercane however.
Superstition dictates that rarer and more powerful items will yield children of equally extraordinary capacities. Thus, mercane society is in constant bickering about whether items can be destroyed, and if so, who will receive the power.