Ultima (Final Fantasy XII), Final Fantasy Wiki

Masterpiece among the scions created by the gods, and the mastermind of the plot to rise against them. Prior to her betrayal, she was tasked with guiding souls to heaven and aiding in their reincarnation. Called the High Seraph for her angelic wings of glimmering gold, yet it was on wings of deepest black that the tainted angel Ultima rose against the gods. Since her fall, her heart is without light, and impossible to know.Clan Primer Bio Ultima, the High Seraph is an optional level three Esper

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Ultima (Final Fantasy XII), Final Fantasy Wiki

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So TIL that almost all the Ascians in FFXIV were named after the Scions of Light from FFXII : r/ffxiv

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Ultima (Final Fantasy XII boss), Final Fantasy Wiki