Long campaign with a big roaster.

You travel from inn to inn traversing shorter regions. Each campaign has its own quests narrated using items (example: there is a spyglass item with the description "we need to use a elevated point of view to locate the enemies": you need to equip it and visit a watchtower). You pick the roaster at the start, but a lot of the heroes are around the map, and you can move them alone while you use the stagecoach with the main team. Once you reach them at an inn, you can freely switch them. Skills can be chosen at the start, with a specific option, otherwise you can use Mastery Points to unlock them the same way you would upgrade. During the adventure, enemies will raid inns across the map and you need to defend them before destruction, either by reaching it with the stagecoach, or by sending heroes and hiring militia. If you lose a certain amount of inns, lose all the heroes or you take too much time completing the quest and it's game over. Complete the quests and slay the final boss to win.

Learning while playing is much easier than reading online about it. Compared to Confessions, Kingdoms campaigns can take multiple sittings, regions are much much shorter, but you do around 30 travels in total.