The origins of the Shopkeeper are lost in time and legend.
It is said that the Shopkeeper will appear when necessary and provide items, commodities, and information, for a price, even if you are in the most inhospitable place in the world.
Deep within an ice-covered cavern, or in an arid desert, or in the heart of a volcano, or even under the sea, adventurers in need of the Shopkeeper’s special services, report having witnessed the appearance of its dimension-traveling establishment in the most unlikely of locations.
Those that meet with the Shopkeeper, speak of fair trade, intelligence, and wisdom, as well as the presence of several unique magical items…
The Shopkeeper is a new DM mechanic in the form of a recurring NPC, that aims to solve the ever-present problem of trading available for the Player Characters.
The DM will decide, when, where, and in what context the Shopkeeper appears, nudging the players forward and relieving them of their gold in exchange for goods and services.
- from the publisher's blurb