Moe Chronicle

An Aura-Attack combo is made when you repeatedly hit enemies with their weak element. You can experiment during battle, or you can use the monster guide at the inn to identify the monster's aura and thus its weakness. (Fire > Air > Earth > Water > Fire, or Red > Green > Orange > Blue > Red if you're going by color.)

Using a normal-damage (non-aura) attack will break your combo, as will using an aura attack on a monster that is not weak to it. If you have an accessory equipped that adds an elemental aura to your normal attack, this will count as an aura attack and will not break the combo, provided the monster you use it on is weak to that element. (NOTE: Accessories that add elemental auras to normal attacks do not also add elemental auras to normal-attack skills such as "Armor Break" or "Not a Chance".) Using an aura attack that damages all enemies at once will only preserve your combo if all the monsters you hit are weak to that attack (and it will only increment your combo by 1, not by the total number of enemies hit). The combo will not be broken by using non-attack moves such as healing, DEF/MDF up, defense, charm, Io's actions, Otton's fury attack, or the actions of your pets.

You can earn these trophies anytime, but larger combos are easier to pull off once your party members have a wider set of unlocked aura attacks available to them.