How can I change the difficulty level?

In Crown Gambit, you can choose between 4 difficulty levels:

Novice: Bosses have fewer HP than you and you deal more damage. You also recover all your HP after a fight.
Soldier: No stat bonuses for you or the bosses, and you only recover a moderate amount of HP after a fight.
Knight: Enemies have a small HP bonus, deal slightly more damage, start fights with a bonus, and you only recover a small amount of HP after a fight.
Paladin: Enemies have more HP, deal more damage, start fights with bonuses, and you only recover a small portion of your HP after a fight.

You can decide to switch to a lower or higher difficulty at any time by going to the Settings > Gameplay menu, except when you are engaged in combat.