Nibel Reactor

Nibel Reactor is a Mako Reactor on top of Mt. Nibel owned by the Shinra Electric Power Company, and the location where Jenova was stored. It is visited in Final Fantasy VII in a flashback and during the party's route through Mt. Nibel to reach Rocket Town, and seen in Crisis Core -Final Fantasy VII.

Story
Five years prior to the events of Final Fantasy VII, Sephiroth, Zack Fair, and several Shinra troops — including Cloud Strife — were sent to Nibelheim to investigate the reactor. After Tifa guided them through the mountain, she was forbid entry due to not being affiliated with Shinra. Inside was a sealed chamber with the text "Jenova" above the door, and Sephiroth deduced the reason the reactor was malfunctioning was a broken section in the Mako purification tanks, as Hojo had placed several makonoids — human test subjects — in the tanks.

Troubled by the idea he was created by the same process as the beings in the Mako tanks (as well as Genesis Rhapsodos explaining that Sephiroth was "Shinra's perfect monster"), Sephiroth returned to Nibelheim to investigate the matter. For several sleepless days he stayed in the Shinra Mansion's basement to read on the Jenova Project. Sephiroth was driven mad by the findings and razed Nibelheim before returning to Mt. Nibel to claim Jenova's remains. Tifa chased after him with a newfound hatred for SOLDIER and Shinra, but was easily cut down. Zack battled Sephiroth, but was defeated. Cloud, having followed Zack and Tifa, defeated Sephiroth and flung him into the Lifestream below the reactor. The collapsed Zack and Cloud were claimed by Shinra and used as test subjects, but before Shinra's arrival Tifa's teacher, Zangan, took Tifa away to Midgar to recover.

During the events of Final Fantasy VII, Cloud Strife and his party cross Mt. Nibel during their worldwide pursuit of Sephiroth.

Reactor Approach

 * Twin Brain x2, Sonic Speed
 * Twin Brain x3
 * Sonic Speed x3
 * Zuu (doesn't appear during the flashback)
 * Screamer x2, Twin Brain (doesn't appear during the flashback)

Reactor Area

 * Twin Brain x2, Sonic Speed
 * Twin Brain x3
 * Sonic Speed x3
 * Zuu (doesn't appear during the flashback)
 * Screamer x2, Twin Brain (doesn't appear during the flashback)
 * Screamer x2 (Back attack) (doesn't appear during the flashback)

In Front of the Reactor

 * Twin Brain x2, Sonic Speed
 * Twin Brain x3
 * Sonic Speed x3
 * Zuu (doesn't appear during the flashback)
 * Screamer x2, Twin Brain (doesn't appear during the flashback)
 * Screamer x2 (Back attack) (doesn't appear during the flashback)
 * Screamer x2 (Ambush) (doesn't appear during the flashback)

Musical Themes
0 "Mako Reactor", the typical theme inside of reactors, plays when inside the Reactor during both the flashback and the present day return.

In Crisis Core -Final Fantasy VII-, "The Skyscraper of Iron and Steel" plays.