Lunar Ramuh is an optional boss in the Finest Fantasy for Advance and Final Fantasy IV: The Complete Collection versions of Final Fantasy IV. It is fought during Cid's Lunar Trial at the Lunar Ruins. When beaten, the player obtains the Flare Sledgehammer, Cid's ultimate weapon, and the Grimoire LR which, if used as an item, summons Lunar Ramuh to deal 9,999 Thunder-based damage to all enemies. Using up the Grimoire unlocks the trial door again.