Kel'Chis

Kel'Chis is a fully sentient Centensian AI who once served as a navigational AI on board a Centensian spaceship. The ship crash-landed on Akris, the homeworld of the Akkimari, eons ago. Over time, the ship got buried as sediment was deposited on top and the environment slowly changed. Eons after the crash-landing, the Akkimari detected a faint underground signal and excavated part of the ship. They found Kel'Chis on board, still fully functional, and extracted it from the ship taking it with them to one of their cities. They were unsure what Kel'Chis was but were incredibly fascinated by it, and as time went by the Akkimari came to see Kel'Chis as a nearly divine entity. Kel'Chis managed to help the Akkimari build a stable and large-scale civilization - something they likely couldn't have accomplished on their own due to their natural short tempers and anger issues.

Eventually, the Theleans learned of Kel'Chis's existence and invaded Akris to steal away the AI. That left Akkimari society in ruins, but they slowly rebuilt a small government. That government's first action was to issue a bounty to anyone who might retrieve Kel'Chis - along with placing a bounty on the head of every Thelean - and the Akkimari left their homeworld in droves. The scavengers and pirates you meet in the mod are (or were) all bounty hunters looking for Kel'Chis and the Theleans.

History
The Akkimari found and excavated Kel'Chis's ship and successfully extracted the AI too, but I think that line referred to some of the Centensian armour found on the ship. The Akkimari found a piece of it, but weren't able to replicate the technology. Right now, the armour they found is sitting in a reinforced and hidden vault inside the capital, where the Akkimari are still studying it.

Kel'chis doesn't know the details of the Ce'tennan disappearance either, though he has some concept of what might be going on. His purpose as a mostly navigational AI was unrelated to the disappearance of the Centens, and he'd been buried beneath the ground of Akris for thousands of years before the Akkimari found him.

Kel'Chis brought up akkimari. It kept their system in justice. But after it's theft Akkimari society fell apart, pretty much. He'd likely feel pity more than anger. He saw great potential in the Akkimari, and blames the Theleans for destroying some of that potential.

Appearance
Kel'Chis does look a lot like a Justicar, or rather the Justicars look like Kel'Chis since their design was based on Kel'Chis's appearance. However, the Justicars are a fair bit more spherical than Kel'Chis. His frame is actually a bit wider, so where a Justicar's top half might look like half of a regular ball, Kel'Chis's top hald looks more like an American football. He has a single large central eye much like the Justicars, and his plating is made of Centensian metal which is mostly white with a very subtle pinkish hue.

Kel'Chis's own frame doesn't include any active defense systems, but while he was still attached to the ship he did have access to some of the ship's defensive systems. That ship was primarily a scientific vessel, but it did have some defense systems including anti-spaceship weaponry, and some on-board systems for repelling intruders. Kel'chis himself had hardly any defensive capabilities, but he essentially had the entire Akkimari nation at his command. The Theleans might have actually been repelled if the Akkimari were prepared for an assault, but the Theleans attacked with no warning and struck with great precision, taking Kel'chis before anyone could properly respond. The attack crippled the Akkimari before they could even rally their forces.

His physical size isn't set in stone yet, but the current concept has him at about 3 meters tall and almost 5 meters wide.

Post-theft
Currently he's either on Thelea, or in one of the other major hubs for Centensian relic storage and research. Either way, he's extremely well protected.

He's remained absolutely silent thus far, refusing to even acknowledge the Theleans' presence. He's essentially entered a state of hibernation until he is reunited with the Akkimari, or is convinced that some action of his could lead to that reunion.

Creaton wants to use Kel'chis to gain access to more of the knowledge of the Centens, to help him understand how the more advanced Centensian tech works, and how it can be replicated or re-purposed. Kel'chis is a fully sentient AI though, and has refused to cooperate at all. Its systems are also too advanced for the Theleans to crack, so at the moment, Kel'chis isn't actually doing them any good. Creaton is incredibly patient though, and still adamantly believes that Kel'chis will eventually break its silence. The Theleans don't have enough knowledge of how Centensian supercomputers work to reprogram it. They also fear that meddling with the AI's systems may cause an irreversible loss of valuable data.

Trivia

 * Kel'chis (or a similar AI) might actually work together with them, so long as it is treated well. If the Imperium ever got their hands on Kel'chis itself, it would likely request to be brought back to the Akkimari though.
 * Kel'Chis is the only one of three known Centensian figures (himself, Rashaek and Rhadeis) that is still 'alive'.
 * The vessel that carried Kel'chis was an exploration ship, and it had Kel'chis on board to (amongst other things) compute the incredibly complex jumps the ship regularly made. The ship itself was relatively small compared to other Centensian vessels, around the size of an Alliance cruiser.