This is actually what i exclusively farm atm to get as much High Ampules as possible. However 60 Stamina Cost and 300 Medals max per run makes it still a long grind for me since well i was not frugal with my Stamina Pots at all but that's really my fault for not playing consistenly in the past and saving them up like you guys did.

When i heard maotd for example has so many Stamina Pots i was shocked and dumbfounded really. The Addition of the Decisive Battles i really like cause i think this and exclusively (or almost exclusively) going for the High Ampules during World Expo is the only somewhat steady income of the Ampules atm.

I wish though they would make the grind for one of those two a bit easier: Petite Oath Heart (increase the rate maybe a bit) or High Ampules. One of those two