Black Sigil: Blade of the Exiled Cheats

Unlock Vai
Collect the five armaments after the world is fused, then return to Isapolis.

Obtain the secret character "Doll"
To obtain Doll, one of the two secret characters, you must first get Nephi after visiting the entrance of Isopolis. Once you have done that, go back to the Corridor of Clouds and return to the entrance of Abraxus' Tower. Instead of entering the Tower, simply go to the right and examine the door you see there for Nephi to unlock it. Once you have done that, you must locate where a purple person is and examine him, after a brief scene, you will now have Doll in your party. Be sure to scour the workshop to get useful armor for your party!

Sigil Equipment
After The Forbidden takes control of Vai and partially fuses Artania with the Black Rift, you can obtain the Sigil equipment (previously the Armaments).

Sigil Armlet: Go to the Desert of Black Sand located east of Polamaze. Make your way to the dungeon located in the south-east and defeat the boss to obtain the Arml
Sigil Armor: go to the Arena (where Xanadu previously was) and enter the Team Battle; make it up to the 9th battle, then opt out.
Sigil Blade: Visit Tradefair the quest for this piece. The Blade can then be obtained by defeating the boss of Draken Mansion.
Sigil Helm: buy in a shop right next to the clothes shop in Tradefair; it costs 100,000 GP and is the only item for sale.
Sigil Necklace: beat the boss on the bridge leading to Tradefair