The Promethians are a fictional race of aliens from the Palladium Games Megaverse that exist in an extradimensional universe within the game setting of Rifts, located in an intergalactic region of space which is usually referred to as the Three Galaxies.
The Promethians first appeared in the Palladium Games book entitled Rifts: Dimension Book Two: Phase World, and were created by C.J. Carella.
For reasons unknown, the Promethians do very, very little to restrict activities within Center itself; absolutely anything is allowed within the arcology, including but not limited to, mass starvation, slavery, murder, and cannibalism; the only time that the Promethians show any interest in the goings-on of Center is when an enemy force tries to take control of the transdimensional spacegates and Rifts, or when a conquering force attempts to take over Phase World altogether. On one occasion, the Promethians allowed a two-year civil war to be waged within Center's confines that killed over thirty million of its inhabitants; the Promethians' only course of action was to selectively apply a series of force fields to keep the fighting from reaching the spaceports or from breaking out of Center and spilling out onto the planet's surface. In addition, the Promethians are well known for selling their technology to any buyer that can afford it, friend or foe, and in similar fashion neither helping nor hindering fugitives that manage to reach Center -or the bounty hunters or law enforcement that may be in pursuit.
It is strongly implied to the reader that the Promethians are concerned first and foremost about cosmic-level threats to the entire Megaverse, such as the effort to keep the Old Ones from waking, and that "little things" like world-spanning wars and "morality" are simply too much of a distraction from the importance of their universal mission.
The Promethians exist in two forms -namely, first- and second-stage Promethians. The first-stage Promethians are 7 to tall, are entirely 'human' in the range of possible outlooks and alignments, and the natural phase abilities of their bodies renders any force or energies directed against them to cause no more than a point-for-point conversion to "Standard" damage (termed in the Palladium game setting as S.D.C.), no matter how powerful the originating force. Those Promethians that manage to survive and pass the Test of Maturity are transformed into larger, more durable versions of their old selves that range from 15 to in height. These creatures are immune to S.D.C. Weapons, they each gain up to 2400 points of what is termed "Mega Damage Capacity" in the Palladium Gaming system, and all forces directed at them cause only 1/4 damage, no matter how powerful the originating force. The second-stage Promethians make up the majority of the Promethians on the planet outside Center (actually, the second-stage Promethians are found no where else in the Megaverse except on Phase World), and it is they who are the ones tasked with the universal mission of identifying and countering the greatest threats to the Palladium Megaverse. The second-stagers are also the ones who are possessed of "...an alien way of thinking.. and do not live by morals as most sentients understand them; they are prepared to do whatever it takes to safeguard the Megaverse, even if the actions taken appear to be "evil" by outside observers.
As previously stated, Promethians can opt to make themselves either completely intangible and able to walk through physical objects, or can take themselves completely out of phase with the dimension that they are in and thereby render themselves completely unobservable and undetectable by any means including magic.