Advice on choosing units and Morale bug

[atlatea]

I think lv 17 is too low to tackle hagni. Ideal lv is about 25 or 30.

Yet undead have units that can't be retaliated, have target spell, and your problem are solved, except perhaps gaints geyser maniac or dragons team.

You still need paladin even if you go orcs, elves, etc. The only exception is all demon and undead.

By keepers do you mean keeper of the eventus tower or arfifact keeper or other keeper?

If it is keeper of the eventus tower, then you can't have all race army (all humans, all elves, etc), because you can only bring one of your troop, you must choose the rest from the random troop inside the tower.

As for the guide to this tower, just search the thread in this forum. Though i personally recomend black dragons for all floors except the unit copy floor.