Origin
The Celestials, creators of both the Eternals and the Deviants on Earth, later created the Brethren. The Brethren were formed not from humanoid forms like the previous creations, but instead from bacterial life from the planet Omega Climion Six. The Brethren were used as a weapon of Arishem the Judge, who would determine if a planets life forms were worthy. If Arishem found them unworthy, he would send the Brethren in to eradicate all life on the planet. For an unknown reason the Celestials eventually left the Brethren to wander the Universe, but they were eventually found and captured by the Collector.
On his 15th birthday he and his brother learned the truth of the Brethren’s origins, and from that point, are the only two of their people to know the truth. One brother goes on to lead his people as Thane, while the other is driven mad by the Truth. The two brothers keep this information secret and it is passed to the Thane’s sons when they turn 15.
Creation
Member of the alien race the Brethren Fool was created by Bob Harras Tom Palmer and Andy Kubert , and first appeared in Avengers Vol 1 #334.
Powers and Abilities
The Fool was driven mad by the truth of his race, making him erratic and even shunned by his own race. Though all Brethren share a hive mind, Fool is the strongest telepath among his people.