1167. When asked about where the omnicidal Count Bleck of Super Paper Mario got the Dark Prognosticus, a tome full of prophecies with which to obliterate the multiverse, you think about it, and realize... Ceridwen must've done it.
EDIT: 1168. You then begin considering how other omnicidal maniacs throughout the multiverse might be connected to Ceridwen, and have so far found a potential connection for everyone but Ignus the Necrons. (EDIT: thanks Tyrs... and how! But while driving to my grandmother's, I got to thinking of the Necrons and... yeah. Other than the method being "kill everything," the Necrons have the exact opposite goal of Ceridwen... permanently sever the link between Hell and reality, instead of merge them.)