ITEM VALUES
Money can be earned in Gods & Kings and used to purchase items.
In addition, specific factions can purchase specific items:
Dark Elves and Drakes can purchase Fireballs.
Orcs can purchase Potions of Strength.
Dwarves can purchase Books of Mending.
Humans can purchase Emeralds.
Item Values: https://www.naughtynathan.co.uk/minecraft/prices.htm