[Sword of Convallaria] Nungal Doing 130,000 Damage In One Turn (Weaponry Trial III) 

Tactics: Maneuver Command, War Horn
The Wand + Cup engraving actually doesn't do anything here and could have been Sword + Pentacle for 12% ATK.
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Here are the roles of each unit:
Edda: Puts Liquor on the boss, slowing and debuffing M.DEF. Longbow of Martyrs debuffs the boss to take 10% more damage. She also provides DMG III.
Inanna: Provides Co-Attack, ATK II, and gives Nungal a second turn.
Cocoa: Gives Nungal a needed 1 NRG, as well as Crit II and Crit DMG I.
Nonowill: Kills the mobs to stack the Devil Tarot, debuffs the boss with Vulnerable III, debuffs M.DEF II down with disaster bottle, and ensures Infection.
Nungal: Does 20% more damage to an infected target with Whale Hunter, does more damage the farther away she is.