Red Star

"The red star had hovered above the island of Mata Nui in the days when Kopaka and his allies first arrived. Much later, he and the others learned that the star was in fact some kind of booster rocket system used by the Mata Nui robot to break free of a planet’s gravitational pull. It was not a true star, but an engine. [...] 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."

- Narratator, The Powers That Be

The Red Star was a mysterious object akin to a booster rocket, located in the skies of Mata Nui and Voya Nui.

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

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, and was responsible for the transformation of the Toa Inika. Gali Nuva later realized that there was something alive inside the Star by looking at it through a telescope with her Akaku Nuva activated.

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

The Powers That Be
Right before his death, Tren Krom mentally screamed to 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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