For The King

In the game's main menu there is an option called the Lore Store where you can use the "lore" you collect via playing the game (normally through completing the main quest but also through killing certain enemies such as the different Scourge or completing random encounters) to buy new things to add to your campaigns. It initially has a bunch of locked options but you can unlock a few purchasable things ranging from new items, mini-encounters, player classes, shops, customization options, etc. A few will unlock as soon as you start your first For The King campaign but others have more complicated requisites to unlock such as finishing a campaign or completing a specific random encounter.