User blog comment:SayuriDarling/The Burning Maze Official Discussion/@comment-33340147-20180507122306

Riordan probably didn't planned it that way. Out of the seven, the only ones who can die without causing much trouble in fan-following are Jason, Piper, Frank and Hazel. I still strongly believe he just got very angry with all those fan messages which always cry about him not killing characters so he killed off the next biggest thing after Percy: Jason. Either that, or he reads this wiki. I, the predictor, predict that someone from Camp Jupiter would be the last death of a main character in this series. Also, is this series a pentalogy or seven novels? Because there isn't much time for Apollo to capture all oracles.