User blog comment:Andraaw/Will the world end in Heroes of Olympus?/@comment-3146930-20120128220031

The world could be referring to Gaea, as she is the embodiment of the earth. Or by fall, it could be that the world must fall back into a state of sleep. The Omega is the last letter of the original Greek alphabet, but it could just be a logo for the series as this could be the end of the Camp Half-Blood series