Fictionary for Rick Riordan's Olympians novels.
This Fictionary covers content in:
Percy Jackson & the Olympians 1-4 (Complete), The Demigod Files, The Demigod Diaries, The Heroes of Olympus 1-2 (The Son of Neptune)
The Heroes of Olympus 3 - The Mark of Athena
This would be appropriate for re-reading those books or for first reads of subsequent books in the series.