The Cartographer's Chisel is a currency item that can be used to improve the quality of a map. It can be obtained by selling certain map items to any vendor, or by using certain divination cards.

To obtain the Cartographer's Chisel, players must first collect certain map items that can be sold to a vendor. The items include Cartographer's Sextants, Cartographer's Chisels, Cartographer's Seals, and Cartographer's Scarabs. Once these items have been collected, they can be sold to a vendor in exchange for a Cartographer's Chisel.

Once a Cartographer's Chisel has been obtained, it can then be used to improve the quality of a map. To do this, players simply need to use the chisel on a map that has been placed in their map device. This will increase the quality of the map by one level, up to a maximum of 20%.

The Cartographer's Chisel can also be used to purchase certain divination cards from Tasuni in Highgate. These divination cards can be exchanged for valuable items such as Exalted Orbs and Chaos Orbs.

Finally, players can also use the Cartographer's Chisel to purchase certain unique items from Zana in the map device. These unique items can be exchanged for powerful rewards such as rare currency items and powerful unique items.