The most useful monster.

Thank you for your answer! I just don't quite understand the concept of a "safe spot"... Although it's always talked about.

Have you ever encountered a battlefield where, for example, a Fairy can hide in a corner of the map on a small patch of free space that is surrounded by rocks and trees, and where no enemy can attack the Fairy unless they have the appropriate units? For example, 5 Black Dragons. I especially like using a Harpy in such a battle :) In this case, you don't even need to worry about morale. Just position the Harpy in a "safe spot," wait for the enemy to approach the obstacles and start to cluster together, and then activate auto-battle and watch as the Harpy viciously tears apart the enemy troops until they are all dead :)