Warning! This article contains spoilers for Eternals! Read at your own risk!
Eternals: Who is Arishem the Judge?
One of the eldest of the Celestials, Arishem is the leader and is one of the most powerful beings in the universe being a cosmic one. The Eternals were created by the Celestials they paid Earth a visit a million years ago. In here, they had genetic experiments with humans resulting in two races: the Eternals, the winners of the gene pool of perfection as all of them are in perfect shape, with perfect appearance, and with cosmic powers; and the Deviants who were monster-like and genetically unstable creatures. The Celestials are giant humanoids who lorded over races, even predating the Asgardians. They are millennium-old creatures who were there when the universe was created. Just by how little information were shared about the Celestials in the MCU, their arrival makes it more interesting as they are expected to be extremely powerful beings. In various occasions, the Celestials have been discussed in the MCU like when The Collector was explaining to the Guardians of The Galaxy the Power Stone where a Celestial named Eson used the Power Stone to “judge” and eradicate civilizations thousands of years before, and when Nebula called Vormir the center of “Celestial Civilization.” The place Knowhere was also believed to be the skull of a Celestial.
In the Eternals, Arishem is introduced as the Prime Celestial and he summoned Sersi and the others as he said to them that they will be judged for their actions. As for Arishem, he is the leader of one of the most powerful races, the Celestials, and they are seeking out various planets for their cultivation of new Celestials. He is known as the Judge, the one who puts the trial on the basis of the evolution and growth of the Eternals. He determines whether there is a problem or not, whether those who were given cosmic energy were worth such power. See Arishem in Eternals now available to stream on Disney+.