Spectralism

Spectralism is a religious movement from the IDW portion of the Generation 1 continuity family.

Spectralism is a Cybertronian religious movement, placing great importance on colors, and their meaning. For example, blue and purple are considered both a sign of grief and a statement of intent to kill. They also have a greeting identified as the "Call of the Wavelength". Spectralist funerial customs involve making a coffin from material found at the scene of the deceased's death. Not much is known about it at the moment.

Fiction

IDW Generation 1 Continuity

After a near-death experience, Drift became a practicing spectralist. When Thunderclash visited the Lost Light, he recognized Drift as a spectralist and gave him the Call of the Wavelength, before agreeing with him that the emotional discomfort in the room was making the moment "magenta". Little Victories Going by this and Drift's explanation of purple and blue as related to violence and grief, it's safe to say that darker colors such as purple and blue often have negative meanings.

Before he was forced off the ship, Drift also had tried to convert Rodimus, to no apparent luck. Predestination: A Beginner's Guide

On the duplicate Lost Light created by the ship's malfunction on take-off, Rodimus was buried spectralist-style on Drift's insistence after his demise fighting a sparkeater. Predestination: A Beginner's Guide slaughterhouse Part 2: The Road Not Taken

Rodimus converted to Spectralism after Skids' death and took on a blue and purple paintjob. When Drift questioned whether it was a promise to kill Getaway or a way to mourn Skids, Rodimus refused to answer. Dissolution Part 1: Some Other Cybertron