Collect the five armaments after the world is fused, then return to Isapolis.
Submitted by Raining Metal
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 Armlet
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
Submitted by Pink Martini