The fight consists of 14 different phases, based on its Arcana. Striking Nyx Avatar with a critical hit will confer no benefit aside from additional damage, removing the possibility of All-Out Attacks. Nyx Avatar can attack twice each turn (more if its attacks exploit a weakness or strike for critical). As with every boss in the game, Light and Dark attacks are blocked. As such, conserving items until its final stages is recommended. However, it is also a long boss battle depending on the player and their progress, it may take as long as an hour. Nyx Avatar is the final boss of the game, as such, players can go liberal with all of the items they have. While the Death Arcana represents transition, change, regeneration, and cycles, the inverse Death Arcana represents stillness, stagnation, death and the end of things. Like the Shadow Arcana, Nyx Avatar represents the inverse interpretation of the Death Arcana. It flies up the sky and summons Nyx anyway, prompting the protagonist to face Nyx alone and then seal it by sacrificing their life force. Once it is defeated, it displays that its fall is irrelevant to Nyx's descent to wipe out all humanity. Night Queen deals heavy damage to all opponents, inflicting a myriad of random status effects on the party. Moonless Gown reflects all attacks, including Almighty skills. During the final phase, it begins to use two unique skills when its HP goes under a certain threshold - Moonless Gown and Night Queen. Each Arcana is considered a separate enemy, allowing the Avatar to have a grand total of 14 phases. In battle, it harnesses a total of 14 Arcana - from the Fool to its true Arcana, Death. Its hairdo is similar to Ryoji's, although its face is now a white mask, and the eyes and mouth of the mask are of a hollow black and presents itself with a blank, frightening smile. Its sword is abnormally long and is around the same height as the Nyx Avatar itself. It wears a crown that has a very narrow base and resembles a bowl with 4 broad tips protruding from it. Its legs are very slender and point tipped, and it also has four large wings that are on the same level as its hips. It is extremely tall and is likely taller than Arcana Priestess standing up. It is a slender and intimidating figure that wears a black, cape like armor by the waist, which has a pair of extremely long tips protruding from it from both sides.

Death is the incarnation of the Arcana that was never meant to be, and because it went through so many changes, Nyx can be recognized as any one of the following entities: Death ( Thanatos), Ryoji Mochizuki, Pharos, and Nyx Avatar.

Before becoming the Avatar it was known as Death (or ' Thanatos, the bringer of death'), The Appraiser and the harbinger of the Fall. Nyx Avatar is the final boss of Persona 3, fought by SEES. Persona 3 FES The Journey FINAL Boss NYX Hard

Nyxia 3