|Height:||720 centimetres (23 ft 7 in)|
|Length:||22 metres (72 ft 2 in)|
A successful attempt at developing the superior life-form, Cebalrai is capable of surviving in space. Extremely resilient, the creature is the rigel's final stage of growth. Cebalrai displays aggressiveness that is well beyond its predatory instinct. It is named after the star Beta Ophiuchi, the traditional name of which being Cebalrai.
Created by M.T.H.R. in her second attempt to create a life-form capable of surviving in the vacuum of space; the previous failed experiment was the Australis. It went unnoticed by the S.O.A.R. team until it almost killed Patrick in the Deck Sector.
After M.T.H.R. was terminated, Cebalrai attacked the two surviving S.O.A.R. team members and a sentient android called "Caren". Chasing them down a shaft, its great mass weakened the structure. Noticing this, Caren sacrificed herself in luring the beast to come to the edge, where the structure gave way and collapsed with the beast going down with it.
Just before the U.N. Ozymandias was destroyed, Cebalrai escaped from its metaphorical tomb and made its way into vacuum. There, it attacked a support ship that had been docked with the Ozymandias. After a battle with Patrick Tyler, the beast was defeated by the Final WASP and was knocked into the vacuum of space.
As with the Australis, Cebalrai is capable of releasing a strong bio-electric field to stun its prey. However, it does not have the ability to regain health like the aforementioned Australis.
Like in its younger Rigel form, Cebalrai is capable of undergoing further metamorphosis by way of growing a third head.
Like other large dinosaurs, the Cebelrai will often try to bite the player with its powerful jaws. Possessing two heads, it will be able to attack more often. It can also release electric blasts like Australis, though its own attacks are essentially more powerful.
In the first boss stage, it is recommended that players simply run away from it and continue to the Engines Sector, where it will stumble into a shaft in a cutscene.
In its second boss stage, players must simply fire at the Cebalrai to stop it from getting closer. WASPs can also help distract the beast while the player charges any LASER-based weapons.