It is accessible once Yuri can return to Europe. Go to Florence and speak with a fat pedestrian. He tells Yuri that he knows of a castle with a great treasure and that there is a mirror where a demon emerges.
Upon entering Tiffagues Castle, Karin and Yuri remember that it looks similar to Mirror Palace. Like Mirror Palace, Yuri can enter different areas of the castle through the mirrors. However some open certain ways, and it is difficult to find a way back.
Several children are found in the castle, one in which always leaves a door locked. It is possible to go through it, but only on her side. Another child to look out for is a Lottery Member, whose jackpot prize is Demon Ward - a useful accessory in this dungeon. After the next Save Point is found, progress through the hall to its left and fight the enemies that appear.
Finally Yuri enters the chamber with the mirror. He meets with Albert Simon, who explains the significance of the castle and Yuri tells him that he defeated Rasputin. Then Yuri and his friends must fight Neo Amon.
After defeating Neo Amon, Yuri can now fuse with him and the Amon crest is dropped.
If Blanca defeated Lobo and visits Montmartre before going to Tiffauges Castle, Henri can be encountered again in this dungeon.
- The Devil Card
Tiffagus Castle or also known as Chateau de Tiffauges is a French medival castle that once was home to Gilles de Rais, a fellow soldier in the Hundred Year War with Joan of Arc and a nobleman. According to the testimonies given by the cleric Francois Prelati and priest Eustache Blanchet, Gilles de Rais was involved in alchemy and demon summoning, de Rais was said to have sucessfully summoned a demon named Barron. Who the clergymen said was angry and required children parts which de Rais supposdly put in a glass vessel to appease him. Gilles de Rais was charged with murder of countless children and many of his victims were sodomized.
- The NPC Alicia in Wonderland is a reference to Louis Carroll's book Alice in Wonderland.