with what level hero will you defend against archers and mages? with a level 4 hero? wow
squires (if you have them) can withstand 2 hits well, and with magic, even all 4 hits from the enemy. :)
Added after 3 minutes
in my opinion, the most useless monster is the one...
...let me be original...
that doesn't make it to the enemy army before the final battle.