User blog comment:Hyperborean/"The House of Hades" – official expectations blog/@comment-3146930-20130611215552/@comment-6064271-20130613001015

but if you thinking about someone swearing on the river styx at the end of TLO, Percy made the gods swear on the river styx to claim their children before the age of 13 (if im not mistaken), to make more cabins at camp half blood for the minor gods and Hades, and some other things i dont remember