ToS:DotNW - Unison Attacks

The First Movement (第一楽章 - Daiichi Rakushou)
Each spell requires exactly one minor element symbol matching its associated element on the Elemental Grid. The major field element does not matter. At least one monster ally with the same element must be in the active battle party.

The Second Movement (第二楽章 - Daini Rakushou)
Each spell requires exactly two minor element symbol matching its associated element on the Elemental Grid, and a major field element that does not match the same element. Alternatively, if the major field element does match the spell's associated element, there must be only one or two minor element symbols on the Elemental Grid. At least one monster ally with the same element must be in the active battle party.

The Third Movement (第三楽章 - Daisan Rakushou)
Each spell requires a major field element that matches its associated element, and at least three additional minor element symbol that matches the same element on the Elemental Grid. At least one monster ally with the same element must be in the active battle party.

Party Character Artes (味方キャラクターの技 - Mikata Character no Waza)
Each attack requires at least one element symbol that matches the character's elemental alignment. The major field element does not matter.

In addition to the player character, only one other character will use his or her designated attack pattern during a Unison Attack. Ars Nova will override all other attacks if all conditions are met. Emil Castagnier's Devil's Maw and Marta Lualdi's Divine Saber will override all other characters' attacks if the conditions of either attack is met, while that character is in the active party but not controlled by the player.