Gabranth (ガブラス Gaburasu?), also known as Noah fon Ronsenburg (ノア・フォン・ローゼンバーグ Noa fon Rōzenbāgu?), is a 36-year-old Hume Judge Magister of Archadia, as well as the secondary antagonist of Final Fantasy XII. He is Basch's twin brother, and in the introduction to the game is responsible for the deaths of Reks and King Raminas, which are blamed on Basch.[66] After the fall of Landis years prior to the start of the game, Basch left for Dalmasca, leaving behind Noah and their mother, who was suffering from an illness at the time. Noah, however, remained with their mother and moved with her to her home country of Archadia, where he took on his mother's surname of Gabranth. After his mother died of her illness, Gabranth began to hate Basch for abandoning his homeland and family. Noticed by Emperor Gramis, Gabranth joined the Archadian Judges with the Emperor's backing and rose to become a Judge Magister, the position that he holds at the beginning of the game.[67]

During the game, at the Emperor's behest, he acts as an informant on Vayne and is selected as Larsa's protector.[68] Gabranth loathes himself for the framing of his brother and the horrible tasks Vayne and the Empire have commanded him to do, such as killing Drace to prove his loyalty to Vayne after his rise to power.[69][70] He accompanies Bergan and Zargabaath to Mt. Bur-Omisace where Larsa agrees to return with him, to avoid any trouble. Gabranth later was sent to Pharos to "test" Ashe if she would take revenge, attacking the group in rage when they refused to exact vengeance for the wrongs against them as he had; he leaves after his defeat and the arrival of Cid.[66] At the end of the game, after a discussion and fight with Basch, Gabranth decides to make up for his wrongs by protecting Larsa and helping the Resistance kill Vayne. He is fatally injured by Vayne in the process. He dies after the battle, requesting that Basch replace him as the protector of the new Emperor Larsa.[31] Basch agrees, and is later shown serving as "Gabranth" and Larsa's protector. Gabranth is one of the villains and the sole character representing Final Fantasy XII in Dissidia: Final Fantasy, where, as in Final Fantasy XII, he is voiced by Akio Ōtsuka in the Japanese version; in the English version of XII he was voiced by Michael E. Rodgers, but in Dissidia he is instead voiced by Keith Ferguson, the voice for his twin brother Basch in XII.