Sephiroth possesses a unique fighter ability where he unfurls his single black wing (which takes on a purple glow) and enters his Winged Form while announcing 身の程を知れ ("Know your place") or 目障りだ ("Annoying" or "Pathetic"). Once Sephiroth's Winged Form is active, he gains a variety of benefits, including a third jump, damage-based armor on all his smash attacks that resists up to 20%, and a wide variety of stat buffs detailed in the table below. Sephiroth loses the form after being KO'd or through a system of points; typically, Sephiroth will lose his wing upon KOing an opponent, though this varies based on this point system. Once Sephiroth loses his Winged Form, he won't be able to regain it back until he gets KO'd.
As stated by Masahiro Sakurai, Winged Form activates when Sephiroth is "in danger"; specifically, Sephiroth's danger status is determined not only by his current damage percentage, but also the overall state of the match; If he has a stock or score advantage, his Winged Form will activate at later percents, and if he has a stock or score disadvantage, his Winged Form will activate at earlier percents.
For deactivation, Winged Form follows a system of points. A set amounts of points is granted to Sephiroth upon activation depending on the stock difference (50, 65, 90, 100, 110, from two stocks ahead to two stocks behind). It is then detracted from him depending on the following conditions:
Winged Form is an allusion to his "Safer∙Sephiroth" form and his "One-Winged Angel" theme to symbolize his Fallen Hero status. Sephiroth's black wing first appeared in Kingdom Hearts and it later made appearances in the Compilation of Final Fantasy VII, Final Fantasy VII Remake as well as the fighting game Dissidia Final Fantasy, where it appears as Reunion, his EX mode. The staff of Crisis Core stated that the reason why the wing was black was to suggest evil.
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