Lucifer acts similar to Astaroth; however Lucifer's attacks have a Drain effect, and he tends to use the Drain magic quite often. Lucifer also boosts a dangerously high attack and defense, making him a tough enemy to defeat. It is highly advised to use the Blink and Protect spells to lessen the amount of damage the party receives, and attack using high leveled magic (preferably level 8 or higher).
An alternate method of winning is to simply cast a level 8 or higher Teleport.
Lucifer is a Latin word (from lucem ferre), literally meaning "light-bearer". In English, "Lucifer" generally refers to the Devil, although the name is not applied to him in the New Testament. The use of the name "Lucifer" in reference to a fallen angel stems from an interpretation of Isaiah 14:3–20, a passage that speaks of a particular Babylonian King, to whom it gives a title that refers to what in English is called the Day Star or Morning Star (another name for the planet Venus, which appears in the east before the sunrise), as fallen or destined to fall from the heavens or sky. In 2 Peter 1:19 and elsewhere, the same Latin word lucifer is used to refer to the Morning Star, with no relation to the Devil. In post-New Testament times the Latin word lucifer has often been used as a name for the Devil, both in religious writing and in fiction, especially when referring to him before he fell from Heaven. Lucifer is also one of the Seven Princes of Hell, representing the Sin of Pride, often seen as the worst of the Seven Deadly Sins.
While Astaroth is confirmed to be a female in Final Fantasy IV: The After Years, it is unknown if Lucifer shares this gender, too.