Sanctuary Omega Guardian

Essentially what the name suggests. This is the guardian of Sanctuary Omega, one of the four Sanctuaries in Rahtouri (the others being Alpha, Gamma, and Beta).

The first sanctuary built was Sanctuary Alpha, the smallest and most primitively designed sanctuary, built about 41 billion years ago by invertebrates. Today, it still stands tall, and is inhabited by the last remaining sentient invertebrates alive. The inhabitants never leave due to fear of being slaughtered, and are never seen because the guardian is immediately hostile to trespassers and will kill them on sight.

The second sanctuary was Sanctuary Gamma, built by Scaladius and Drakath. This is the second-biggest sanctuary, and is filled with confusing mazes armed with some of the deadliest creatures alive. It was designed mainly to serve as a home for the Crulic Gargoyle brothers, but they abandoned it about fifteen billion years ago. Now, the deepest chamber within it is home to a terrible beast that serves as the sanctuary's guardian, but what it guards exactly is unknown.

The third sanctuary was Sanctuary Beta, built by the Galrants. This is the only sanctuary today that is still full of friendly inhabitants, and its guardian will only attack if a crime is committed. It is used as a city for not only the Galrants, but for anyone who is seeking safety; crime is extremely rare here.

The fourth and last sanctuary was built about five billion years ago by the Pehrisiils. It was called Sanctuary Omega. It was built to be the largest sanctuary, and only was meant to house Pehrisiils. The guardian was bred and raised to kill anything aside from Pehrisiils, with a few notable exceptions (any further info would make this a spoiler, so I'll stop there). Only "key citizens" of the Pehrisiils were admitted into this sanctuary, in order to conduct private operations, including terraforming a barren landmass in the universe they created (their test subject was to be called Earth). What happened in this sanctuary generally stayed in this sanctuary. However, when the Pehrisiils mysteriously disappeared, the Anti Council was quick to claim this sanctuary, claiming their reason to be because it is the biggest (at about fifty-thousand square miles in area). The Anti Council does not allow anybody without clearance into the sanctuary. It is not known what they are conducting in there. (well, I know what they are conducting, but it's a pretty big spoiler)

EDIT: The most recently built sanctuary is Sanctuary Zeta. Essentially, it is not exactly a sanctuary, but rather a stronghold built by Ahkkarhad after he is rebuilt by Scaladius. It houses the Omnicoteph, and its guardian is a single Skulzard protected by Omegawarriors. It is called a private sanctuary by the Anti Council, and the organization does not allow anyone without clearance into the sanctuary; thus, nobody learns of the Anti Council's dirty secret in funding the Omnicoteph.