Shopkeepers are old men who own the various shops that can be found in any of the main areas of the cave. Spelunkers can buy various items from them, provided they have enough money.
If you're feeling brave, it is also possible to rob a shop by either murdering the shopkeeper or by simply snatching the items and running out of the front door, although a successful heist is very difficult pull off.
Shopkeepers are merciless enemies and have zero tolerance for provocation.
Every shopkeeper carries a shotgun, and will not hesitate to use it as soon as you put a foot wrong in their store. They are also in surprisingly good health, capable of physically outperforming the Spelunkers in both athletics and toughness.