Stigma-4
This article is about the Allied Society Quests NPC. For the boss in The Stigma Dreamscape, see Stigma-4 (Boss). 
Stigma-4, originally known as Alpha-4, was fourth among the six matrices that guided the Alphatron Star's mechanized civilization. Since the forcible modification of its memory, it had found new purpose in assisting Jammingway and N-7000 with the operation of the Last Dregs café—a formidable challenge, even for an erstwhile siege logistician.
— Encyclopaedia Eorzea Volume III, p. 227
Stigma-4 is an Omicron in Ultima Thule.
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Lore
Highly sophisticated with superlative processing power, these matrices comprise the Alphatron Star's leadership. As they were built to manage operations rather than participate in them, they are ill-suited to combat, relying instead on units under their command should the need to defend themselves arise.
— Encyclopædia Eorzea Volume III, p. 77
"For maximum efficiency, use of gold salmon roe is strongly advised. All proceeds go to Omicron enhancement initiatives."
One of the six matrices charged with directing Omicron operations, Stigma-4 was revived from hibernation by Stigma-1's command. It was only natural that the logistics matrix would then resume creating materiel for future invasions; however, as the would-be conquered found this somewhat less than ideal, its inner workings were tampered with upon its awakening via ethically dubious means. It now serves peaceably in the operation of the Last Dregs.
— Encyclopaedia Eorzea Volume III, p. 185