Black Sigil: Blade Of The Exiled Cheats (DS)

The Sigil pieces can be found at the following locations:

Sigil Armlet: At the far southeast of the desert in the Black Send sub-area; there are
stairs leading down into a secret area. You must defeat a monster. Note: This
location is due east of Polamaze when walking from there.

Sigil Armor: Take the airship to the northeast area of the map. Enter the city, and fight
in the tournament. Obtained after several fighters.

Sigil Blade: At the Draken Mansion, during the sub-quest with Kairu.

Sigil Helm: Purchased for 100,000 gold at or near the clothier in Tradefair.

Sigil Necklace: At the Cytherian Bridge, on the way to Tradefair.