Red Star

"The red star had hovered above the island of Mata Nui in the days when Kopaka and his allies first arrived. [...] The star was in the sky now above Spherus Magna, and had been since the arrival of the Mata Nui robot on the planet. With the robot destroyed, the red star would not be summoned into use again. Yet still it hung among the true stars, waiting, waiting for a call that would never come."

- Narration, The Powers That Be

The Red Star was an enigmatic celestial object that was located in the skies of Mata Nui and Voya Nui. It contained the mechanism that allowed the Great Spirit Robot to travel from planet to planet. The Star also served as a means of resurrecting the deceased beings in the Matoran Universe. Their bodies were teleported to the Red Star, where their bodies were either repaired or their consciousness were transplanted into a new body.

History
The Red Star was created by the Great Beings after they had created Mata Nui to help the Great Spirit transport himself off planets. The Great Beings also placed the Kestora inside it.

The Star was also used to revive deceased inhabitants of the Matoran Universe.

At some point, Gaardus teleported inside the Red Star, met the Kestora, and left. Some time after his supposed death, Mavrah somehow also arrived in the Red Star.

On Mata Nui, the Red Star was used to predict the future. Lightning sent from the Red Star was responsible for the transformation of the Toa Inika. This lightning was part of a fail-safe, sent down should there be Matoran outside the Great Spirit Robot to create Toa if needed.

One of the tasks on the list of preparations for Mata Nui's awakening was to record the Red Star's location. While looking through the Great Telescope with her Akaku Nuva, Gali noticed life inside the star.

Bara Magna
When Tarduk was cleaning up the Arena Magna, he found a piece of metal where the only thing colored was the Red Star.

The Powers That Be
Right before his death, Tren Krom mentally screamed to Toa Nuva Pohatu and Kopaka an image of the Red Star. Shortly afterward, the two Toa spotted Gaardus in the trees and after a revelation about Gaardus's past, he agreed to take them to the Red Star. Inside Pohatu described it as "Like what the inside of a Toa might look like" and they encountered three Kestora.

Gaardus then teleported away, and the Kestora were flash-frozen by Kopaka. Kopaka and Pohatu then fled, and after some time heard strange noises. Kopaka used his Akaku Nuva to look ahead and saw something. The Toa then ran, and were encountered by the Onu-Matoran Mavrah, who offered them a place to hide. Kopaka and Pohatu followed him inside the room, where Mavrah introduced himself.

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