The Guardian Base is Area X, which can only be reached with a Transerver after complenting the first three missions given by Prairie in order to be qualified as a Guardian. After the defeat of four Pseudoroids. Slither Inc. launched an attack towards Grand Nuage, led by Prometheus and Pandora. The player was then tasked to defend Grand Nuage against Slither troops. Though the player manages to fend off Slither's Galleon's, Prometheus and Pandora managed to break through. The player then confront the two in the engine room, where Pandora retreats and leaving the player and Prometheus fight each other. Defeating Prometheus will cause him to escape.
Most O Disks are located in Area X, and the player can obtain a E Tank with Cédre and a W Tank by hitting the doll in Prairie's room several times. Aile can also change the color scheme of her clothing by speaking to one of the Guardian members. The soundtrack for this area is called Sky High - Grand Nuage.
The Guardian Base appeared in the Mega Man ZX manga.
- Grand Nuage means "Great Cloud" in French.
- The Guardian Base is possibly powered by the Ciel System, as when the player go to the engine room, its power source is similar to what Ciel is holding (in her artwork).
- Prairie's room on the Grand Nuage is full of plush, Cyber-Elf dolls, which is a large cameo to the Mega Man Zero series. One of these dolls, the witch-type Cyber-Elf Totten from the first Zero game, can be cut down from the ceiling and repeatedly attacked. Doing so will eventually merit the dropping of a Weapon Tank.
|Mega Man ZX series|
| Vent • Aile • Ashe • Grey • Girouette • Prairie • Guardians • Hunters • Raiders|
Sage Trinity • Aeolus • Atlas • Thetis • Siarnaq • Serpent • Prometheus • Pandora • Pseudoroids
|Mega Man ZX • Mega Man ZX Advent • Legacy Collection|
|ZX (Vent's story) • ZX (Aile's story) • ZXA (Grey's story) • ZXA (Ashe's story)|
| Biometal • Game of Destiny • Humanoid • Locations • Mega Man |
Mega Man ZX (manga) • ZX Tunes • ZXA Tunes • Rockman ZX Soundsketch - ZX GIGAMIX