Valkyrie Profile: Lenneth Codes -

Seraphic Gate dungeon:
Successfully complete the game and save when prompted after the credits. A new option will be unlocked at the main menu that allows access to the Seraphic Gate dungeon through the cleared saved game file..

Character art:
Unlock all entries for a character at the "Voice Collection" screen. Highlight that character, then press Square to view their art.

Tri-Emblem:
Complete the Seraphic Gate dungeon by defeating Iseria Queen.

Book of Riddles:
Complete the Seraphic Gate dungeon by defeating Iseria Queen two to nine times. One book (eight total) will be awarded each time.

Angel Slayer:
Complete the Seraphic Gate dungeon by defeating Iseria Queen ten times.