User blog comment:KaiserLos24/Mystery of the Shadow Isles (Summary)/@comment-3329904-20141101142009/@comment-1330314-20141102043054

I always thought Karthus was meant to be the Lightbringer, as the shepherd of souls in the Shadow Isles, and that the song was supposed to have biblical connotations: Lucifer's name literally translates to "the light-bringer", so in League the song is about Karthus heralding the end of all life, and out of League the song is about Lucifer reigniting the War in Heaven.