If you write about a place, you need to be right about the place!

The determination that is his biggest strength . . . is also at times his fatal flaw. Like an unthinking machine, he'll just keep shoving, not realizing a step back, a one-night pause, could let some obstacle move out of the way and smooth his path.

your loved ones have been used to lure you into Kronos's traps. Your fatal flaw is personal loyalty Percy. You do not know when it is time to cut your losses. To save a friend you would sacrifice the world.

But of course there is always a hamartia and yours is that oh, my God, even though you HAD FREAKING CANCER you give money to a company in exchange for the chance to acquire YET MORE CANCER.