To do this automatic farming method, you need to be at least at the 5th Palace, so there will be spoilers
First, you need a Persona with Physical Repel. Arahabaki (35 / Hermit) is perfect because you find it in the palace. If youre in NG+ and have stronger ones, feel free to use those. (You can also use a Nul Phys Persona if it has high strength)
Second, quick travel to Shibuya Underground Mall and buy a Hunger Charm from the Jewelry Store (costs 80k)
When youre ready, DISABLE network functions (if its on and the enemy panics, the game will stop to ask you if you want to use network help). Change difficulty to Easy to make your life easier, remove every ally from the party and make sure your melee weapon DOES NOT HAVE a status effect. (E.g. if you rage enemy, they will stop calling for reinforcement)
In the 5th palace, look for Black Ooze enemy (can also be found in 1st floor of Memento area that unlocks after you finish this palace). The enemy should be easily found in the first few rooms of the palace.
As soon as the battle starts, enter Rush Mode (OPTION on PS4, Start on PS3)
Enemies will either attack, try to apply hunger or summon other enemies if there are less than 3
Black Oozes resist physical, but its ok because if you killed them too quickly you wouldnt give them time to summon other enemies
They dont give huge amounts of EXP (around 100 per enemy), but you can leave the game to autofarm while youre sleeping, working or doing whatever (right now, as I am recording and editing the video, Im leaving the game on to farm. Its been running for almost 2 hours)
When you want to play the game, just kill the enemies or run away.
