The Song of Ompalos

Book dealer claims that the spells and incantations from his journal sound very similar to a scroll he's been tracking since he first became a rare book stealer. The lyrics in music were supposedly written by a greek named secilos. He engraved it on the tombstone of his life. But this other song, the song song of ompalos y was puportedly a latin version of the seculos epitaph with a few subtle variations. How so the song of umphalos is supposedly part of some larger grand plan to usher in an age of demonic rule? And as far as catalogical poems go, this one is apparently the golden egg.