Yeah there is currently 3+ challenge... But i completed 100% of the challenge the end challenge is called the fate challenge. Good luck in completing all of it. Wanna read what is in the end?
tip: Put all the unit and 1 or 2 bowmen in the castle exept for 3 hero, 3 militia and 1 chavalerie, the 2 hero need near the chavalerie, the other hero must be near the militia, Can only be 1 group of militia, when the undead are close: do a chavalerie charge. light the trench if needed, the trench can be in the everywhere but must be 3 group maximum spearman behind the gate, swordman as a support.
Yes i completed all the challenge like that.