Shadians

The Shadians are a race of creatures that are the sole inhabitants of the shadow layer

Description
They are composed of one of every sentient being in the multiverse excluding equivalents.

They are all mostly medium gray in color.

Functionally they are immortal. The only way one can die is if all of it's equivalents in the multiverse die.

Society
Their society is similar to a herd of sheep in that there is no definite leader.

The role of each individual is to monitor the multiverse for anything or anyone that is a threat to the multiverse as a whole.

If such a thing is detected they then decide to either warn a race that can handle it or deal with it themselves. If the second is chosen then they simply delete the threat. They are the only race that has the capability of doing so. Good thing they rarely turn to this option.

Trivia

 * They rarely travel outside their own dimension. One notable exclusion is Sliat.
 * An individual's appearance becomes increasingly distorted the longer it stays outside it's native dimension.