There are several different resources and currencies in 'Throne: Kingdom at War' but the premium resource that can be used for everything in-game is Gold. Whenever you make an in-app purchase for Gold at the store you will also receive some useful items in your package. The items you get will depend on your purchase, the smallest package you can buy is $4.99 which gives you 1,500 Gold and the biggest package is $99.99 which will give you 30,000 Gold. If you link your Facebook account with the game you will be rewarded with 1,000 Gold free. You can progress without spending real money but it is a much slower process. You can speed things up by using 'boosts' or by purchasing a VIP membership but soon enough everything will be about waiting for a timer to finish.