Gold is the most important currency in the Kingdom. It can be used to purchase various items and bonuses, as well as to revive troops in the Temple.
You can collect Gold from Dragon Mounds or Golden Mountains (if your Kingdom wins the Clash of Kingdoms). You can also earn it by accomplishing and claiming specific achievements or obtain it as a bonus from a player who has access to the Royal Treasury. The Triumphal Challenge and other seasonal battle passes may also grant Gold as a reward for upgrading the level of your battle pass.