Lunar Shiva

Lunar Shiva is an optional boss in the Game Boy Advance port of Final Fantasy IV. It is fought during Edward Chris von Muir's Lunar Trial at the Lunar Ruins. When beaten, the player obtains the Harmonious Ring, which changes Edward's Sing command to Chant, and the Grimoire LS which, if used as an item, summons Lunar Shiva to deal 9,999 Ice-based damage to all enemies. Using up the Grimoire unlocks the trial door again.

Strategy
Lunar Shiva attacks using physicals and Blizzaga, as well as Flame, which hits the entire party for mediocre damage. She does not counter attacks, but will counter spells by casting Blizzaga on herself to heal for approximately 3,000 damage. She also extends her staff and casts Ice Storm, dealing high damage to the entire party. Rydia and Palom can cast Firaga on her for high damage, and Cecil and Edward should attack her. Rosa and Porom should also be in the party to heal them.

Final Fantasy IV: The After Years

 * Shiva