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The sword can create deadly green lightning and fire, strong enough to fell even the likes of Green Lantern and Martian Manhunter, and its blade is strong enough to stab and cut the likes of Superman and Wonder Woman. Unlike most weapons, a fatal blow from it can permanently kill a god.
Aside from it's offensive powers, a cut from the Flashing Blade's edge may also be used to convey visions of either the past or possible futures, and perhaps it's most fearsome power, instead of simply ending life, it can be used to take it, bestowing the life, form, and power of a slain foe upon it's wielder, as Nemesis used to take Wonder Woman's.
The Flashing Blade is both a weapon and the instrument of her position as goddess of retribution, channeling the anguish of the dead to the wielder as well as their strength.
In one possible future, Diana of Themyscira took it up as Nemesis's champion and used it to strike down the Justice League.
In Nemesis's confrontation with Wonder Woman, Wonder Woman was able to disarm her of it and slew Nemesis with her own blade, only to discover the position, power, and responsibility of Nemesis came to her. Declaring she would be the sword's last wielder, Wonder Woman then sundered the Flashing Blade.
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