User blog comment:Hyperborean/"The House of Hades" – official expectations blog/@comment-202.156.13.10-20121112141619/@comment-202.156.13.11-20121113032452

Maybe fire refers to Frank, as his weakness is fire, so maybe he has to sacrifice himself so that gaea can be stopped or something. Not sure what storm refers to.

Maybe Percy, Jason, Zeus or Thalia. Either that or one of the wind gods