Castlevania: Harmony of Dissonance

Successfully complete the game with the good ending (where you rescue Maxim and Lydie).

Go to Castle B's Skeleton Cave. First, have the Griffin's Wing and go into the double exit save room near the entrance area with the big pillar. While in the save room, save the game then use the Griffin's Wing and go through the roof. You will get Wizard's Urn and Summoning Tome.