User blog comment:Hermione Chase/"The Blood of Olympus" Expectations/@comment-9703010-20140717001552/@comment-5927468-20140719193027

Festus has always been more than just a mindless robot. This is clearly evident in how Leo treats him throughout the series. He is a living member of the team, who just happens to be mechanical. So it stands to reason that he could respond to Piper's charmspeak. Besides, she was able to charm Jason back to life in TLH, albeit aided by the fact that Thanatos was imprisoned at the time. So waking Festus up would be easy by comparison.

Going back to the topic at hand. I've posted this before, but I imagine we'll see a few more minor gods like Triptolemus and the winds.