Proto-Babil

Proto-Babil, along with Geryon, is one of the two exclusive superbosses in the DS remake of Final Fantasy IV. It can only be fought if the player stole the Dark Matter item from Zeromus on their previous playthrough and uses it on the face on the moon's surface. As its name implies, it is a prototype of the Giant of Babil.

Attacks
Proto-Babil is equipped with several of the most powerful attacks in the game, including several new tricks. Initially, it can use the Trap Door's Ninth Dimension for an instant kill (though this is easily dodged by way of Adamant Armor), along with a new move, Light of Babil. This attack will do incredible amounts of damage to anyone, likely doing 9,999 regardless of Adamant Armor use. It will also sometimes counter attacks and magic with the CPU's Laser Barrage.

Once you have done 280,000 points of damage to Proto-Babil, its attack pattern will change. It will randomly either use Heal to recover over 20,000 HP, or it will use its ultimate attack, Divine Judgment, to do 6,000+ points of damage to the entire party. It will also sometimes counter attack with Object 199.

Strategy
A strategy for Proto-Babil is to have a character with Draw Attacks equipped Defend all the time and heal him after Light of Babil, and hit his HP down to as close to 120,000 as you can get. Then Focus three times with Cecil and Kain and use Jump/Darkness to boost the damage as much as possible. With Onion Swords equipped on both characters and some timing you can finish Proto-Babil and completely skip the annoying part with Divine Judgement and Heal.