User blog comment:Hyperborean/"The House of Hades" – official expectations blog/@comment-6068707-20130714151153/@comment-10750309-20130714152552

Can Percy's water abilities heal or cure others? Well in the movie, yes. but in the books, I don't think so. Did you encountered something in the books that Percy has the ability to heal others?

About the cover, we are not sure if that is water. maybe River Lethe? or maybe Phlegethon because the river leads to Tartarus.