User blog comment:Hermione Chase/"The Blood of Olympus" Expectations/@comment-5927468-20140315235438

I think that Leo will have to give up the Argo II and Festus as payment for Nemesis' help unlocking Archimedes' Sphere in MoA. It makes the most sense since she's all about balance. An eye for an eye, or a machine for a machine. My guess is that after the seven have saved world, she'll come calling and Leo will bid a tearful goodbye to his best mechanical friend.