|Final Fantasy IV Advance Enemy|
|Abilities||Big Bang, Mini, Toad, Osmose, Drain, Whirl, Earthquake, Tidal Wave, Tornado, Flame, Lightning, Absorb, Reflect, Black Hole, Fira, Blizzara, Thundara|
|Resistant to||Poison, Blind, Silence, Pig, Mini, Toad, Petrify, Death, Berserk, Confuse, Sleep, Paralyze, Slowing Petrify.|
Zeromus EG is a secret boss in the new Lunar Ruins dungeon of the Game Boy Advance port of Final Fantasy IV. Zeromus EG is fairly stronger than the original Zeromus fought at the Lunar Core. Once the party reaches the 50th and final floor of the dungeon, they get a chance to fight him. After telling the party that it's been a while since he's seen humans, the battle begins.
He is based on the version of Zeromus fought in the Easy Type version of Final Fantasy IV, which was exclusive to Japan. Their sprites are also identical. The EG possibly means "Easy Game" (or End Game).
Zeromus EG's opening is Big Bang. He then casts Toad and Mini in a combo. He is likely to cast these spells on Kain and Cecil. Zeromus EG also doublecasts Osmose and Drain, although they are very weak, and he also uses Whirl. He can also combine various elemental attacks like Earthquake, Tidal Wave, Tornado, Flame and Lightning.
Unlike the original Zeromus, when he is low on HP, he casts Absorb on himself every turn to cure himself. This ignores Reflect and heals based upon his current HP, causing quite an annoyance. He also begins using strong physicals as opposed to magic as his primary offense, throwing five in a row, although he still uses magic.
Some of the Grimoires have effect in this battle. For example, using Grimoire LD against him will turn EG into a toad, which makes his attack and defence reduced to 1, as well as rendering him unable to use his skills. This actually means that he will not be able to damage you during the fight save for a physical that deals 1 damage. Also, Grimoire LA is able to poison him, but the effect is neglible. If you want a easy battle against a 200000HP superboss, then Grimoire LD is the path to take.
After defeating him, he tells the party that he was unaware of the existence of those who could defeat him. He then vanishes and grants the party access to the exit of the Lunar Ruins, and also grants you his entry for the bestiary. Other than that there is no other prize for defeating him but for bragging rights.
The Tornado used in the Tidal Wave/Tornado is simply a non-elemental spell whose power is comparable with that of Fira and other such spells, not the single-digit HP inducing version (though he will use that version in phase 1).
Zeromus EG sometimes skips his 5-hit attack combo.