How do I change the Difficulty Settings? (PC/Mobile)

The Difficulty Settings area is found by clicking the button directly below the player picture in the top-left corner of the screen (the one that shows the current difficulty).

Once inside, players can change the overall difficulty of the game in order to get correspondingly higher experience, gold and soul rewards - but each higher level further multiplies the stats of the enemies' troops. There are six levels: Normal, Hard, and Warlord I-IV.