The way the game seems right now, your either a Wyvern Lord, Falco Knight, Bow Knight, or Dark Knight. Every other unit is subpar.
If you were to design Lunatic mode that rewarded using the other units like Great/Fortress Knights, Paladins, Assassins, War Master, etc, how would you do it?
My original thought was to make enemy archers more of a threat. Give them close combat to force fliers to dismount to engage with them, instead of allowing them to pick archers off and fly to safety. Any other ideas?