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The Advanced Law is a plot device and skillset in Final Fantasy Tactics Advance. Advanced Laws are the strongest of law cards available to a Judge and only the Judgemaster can use them.
The advanced law is used three times in the main plotline of Final Fantasy Tactics Advance, in Mission #009: Antilaws, Mission #018: Quiet Sands, and the first part of Mission #024: Royal Valley by Judgemaster Cid.
Cid uses an Advanced Law on Ezel Berbier, the wanted Hermetic. This Law prevents Ezel from using any ability at all. However, Ezel brings out one of his Antilaws, which neutralizes the Advanced Law and allows him to teleport himself and Marche to safety.
The law is used on villain Llednar Twem who confronts Marche, threatening him with the Omega spell, but Cid warns him that the crystal will break if Llednar uses the spell. Llednar then engages Marche, however around two full turns into the fight he prepares to use Omega but is sent off by Cid for a violation of the Advanced Law, and he is sent to jail immediately.
Llednar once again engages Marche at the entrance to the royal palace. However, an Advanced Antilaw made from amber from Siena Gorge has been crafted in anticipation of this event. The Judgemaster uses this Advanced Law to destroy the "Fortune" Law placed upon Llednar, and Marche is able to defeat him. Upon falling, the Biskmatar turns to stone and fractures.
Advanced Law is the name of the ability set for Judgemaster Cid when he joins the Clan.