Terrible potion drop rates, lots of wasted time and energy.
I'm working my way through the missions, and currently, I'm on one that requires me to win 5 Superior Force Potions from stage 13 or higher of the Force Keep. I battled back to back for 4 HOURS straight, averaging 5-6 minutes per battle on stage 15, and out of that, I only got ONE Force Potion. Just one, and a handful of brews, but that's an entirely different headache. (Seriously, one brew isn't worth 14 Energy).
Can we at least get a 5-10% drop rate on Superior potions? After approximately 75 consecutive runs, only getting one potion would indicate that there's an estimated 1.3% chance at this point. I mean, it's the last stage of the dungeon, a better drop rate would be nice, as it's MUCH easier to get 6* artifacts from lower stages of dungeons than a Superior Potion.