Campaign mode is a set of missions united by a single storyline of a particular faction of heroes.
Your journey begins with the first mission of the Order faction.

Campaign missions can be completed for 1/2/3 stars (determined by the number of heroes who survived by the end of the battle). After completing a 3-star mission, Instant Loot feature is unlocked for this particular mission.
With Instant Loot you don't have to manually replay a mission to get a reward for it. Just tap Instant Loot, and you will get your items in a second!
In order to proceed to a new campaign mission, tap the next flag.
In the sidebar on the right, you can get acquainted with the list of opponents and the rewards that you will receive for completing the mission.  

The amount of Campaign Energy that is spent on completing a particular mission is also indicated below.
After you acquire 3 heroes of the Clans faction, The Rage of the Clans Campaign will be available for you to complete .The Runic Campaign is available from level 14.

And for the most experienced players in the recent release, we've added the "Undead Awakening" campaign (available from level 80).


Hard missions
Hard missions, also known as Heroic missions, are campaign missions for which you can get Herostones as a reward.

They are quite easy to distinguish from others: the flag of a hard mission depicts a hero, whose stones can be obtained for completing the mission.