Percy often found himself using the permission he was given to explore Shadowcrest's library whenever he needed to mull over some things.  The magical world had recently experienced the death of Morgan Le Fey.  It was shocking, to say the least.  And before that, the Titans of Myth had risen.  A cult of Cthulu had even become active once again.  His nerves were so easy to get acting up, but reading through magical texts always calmed him down.  So to ease his mind, he started reading through the books in the library at Shadowcrest.