User blog comment:Hyperborean/"The House of Hades" – official expectations blog/@comment-5247339-20130623145220/@comment-122.167.29.230-20130623162731

I highly doubt anyone would die, atleast not in the HoH. Nico certainly can't die because already he led an ill fated life: He lost his mother and sister, was out of commission for 80 long years, doesn't have a normal life (even by demigod standards) and is haunted from Tartarus. His death would be very harsh. Percy also has suffered alot and throughout the series he wanted to achieve a normal life. So Percy would die after leading a long life. So yeah those two have 99% chance of living.