The battle with the Puera can either be very easy or somewhat frustrating. Each Puera has a physical combo that hits four times and can do 550+ damage if all hits connect. In addition to this, they each have a technique called Death Game that has a possibility of instantly killing the targeted party member.
Luckily, the Lv1 variation of Puera has a Death Game that is easier to deal with that the Lv2 and Lv3 variations. When the four cards are flipped, the options shown will be as such: Both Damage, [name of party member] Dies, Both Recover, and Puera Dies.
To instantly kill the Puera, follow the Puera Dies card with your eyes and select it after the shuffle is complete. However, if Puera is to be absorbed it needs to be killed with a physical attack. Therefore, following Both Recover or Both Damage is the way to go. Gala is weak with Dark magic and Noa has the lowest INT stat, so Vahn is the best choice for absorbing Puera.
For a quick and easy battle, just select Puera Dies each time one of them uses Death Game. The battle can potentially be over in seconds.