Suggestion: Implement "reverse-echo" that buffs enemies for higher drop rates
We know that there exists "echo" in the game that buffs up your party's HP, damage-dealt, and healing recovery.
Well, I know that many including myself have been farming Levi-X a lot and that drop rates on mirror and mount are very, very low. I also know this fight starts to get dull after you've repeated it so many times trying to get these rare drops.
I would suggest a "reverse-echo" be implemented where the party could opt to fight a buffed version of the enemy by selecting a level of "reverse-echo" before the fight - where the enemy's HP, damage, etc. would be buffed up to 25%. In return for fighting at the higher difficulties, we would get higher drop rates on rare items. Also would keep the fight more interesting, particularly for parties that actually have to hold back dps to avoid early enrage.
Just a thought...