noun
Satan; the Devil; the Prince of Darkness
Refers to the supreme evil being in Christianity, often used in fantasy contexts as well.
魔王は天使たちを率いて神に反逆した。
Satan led the angels in rebellion against God.
その物語では、勇者が魔王を倒すために旅に
In that story, the hero sets out on a journey to defeat the Demon Lord.
noun
king of demons (Buddhism)
In Buddhism, the king of demons who obstructs good deeds; often equated with 天魔 (Tenma).
See also: 天魔
仏教では、魔王は修行者の悟りを妨げる存在とされる。
In Buddhism, the demon king is considered a being that obstructs the practitioner's enlightenment.