Gehaburn
The Gehaburn (ゲハバーン Gehabān) is a cursed sword that first appeared in the Conquest route of Hyperdimension Neptunia mk2.
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Functions
In order for one to use the sword, it must receive the offering of a CPUs life. The more CPUs it's given, the stronger it grows.
Other Appearances
Neptunia: Sisters vs Sisters
In one timeline, Arfoire killed all the Candidates except Nepgear, leading to their sisters willingly sacrificing themselves to the Gehaburn so Nepgear could use it to slay Arfoire. She succeeds, but with all her loved ones dead, commits suicide using the sword shortly afterwards. Distraught, Grey Sister shattered Gehaburn and kept a shard to power Ziri's time travel, unaware that Arfoire's lingering soul had overheard what she was saying and hitched a ride with her to the present. Now aware of what the sword could do, Arfoire, now in the past, travels to retrieve it so she could use it to kill all the Goddesses. A fight ensues, and Arfoire winds up leaving without the sword.
Maho uses a shard of Gehaburn to power Ziri to time travel back to the past. She tries to convince the current timeline's version of herself to have both of them kill themselves with it so that Arfoire couldn't use Maho's powers to power herself up, to no avail. Later on, she uses the shard with its remaining power to slay Arfoire.
Etymology
The name is derived from the 2ch channel for Game Industry & Hardware (ゲーム業界、ハードウェア Gēmu gyōkai, hādou~ea) and Caliburn (カリバーン Karibān), a legendary sword used by King Arthur.