Persona Q: Shadow of the Labyrinth’s dungeons feel like Etrian Odyssey, but the battle system is straight out of classic Persona. The Nintendo 3DS game rewards players when they exploit weaknesses with the Boost system.
In addition to doing extra damage, hitting a weak point puts the attacking character into Boost mode. The next time that character takes a turn, their skill cost will not cost any SP. That gives players an opportunity to use really powerful attacks without draining SP.
Boost Mode is also the ticket to doing all out attacks. While in Boost mode you have a chance to do a Follow Up Attack where one character will do an additional attack. If more characters are in Boost Mode you’ll have a higher chance to land an All-Out Attack where the entire five person party strikes.