conquest_end
The bad end in Choujigen Game Neptune Mk2, known as the Conquest Ending.
The CPUs find that the only way to defeat the revived Deity of Sin Magiquone/Arfoire is to use an evil sword which grows in power when it kills one of CPU lineage. ]], Uni,_
The remake, Hyperdimension Neptunia Re;Birth 2: Sisters Generation features an alternate "good" version called the Holy Sword Ending, which splits from the Conquest Ending partway through and leads to a good end.
In Nepnep Connect: Chaos Chanpuru, an alternate version of Nepgear, named Purple Sister V, was introduced, who is heavily implied to be a future version of Nepgear from this route.