While the Makuta were filling the Matoran Universe with Rahi, Hesbrix noticed that his brothers would abandon the creatures after their creation. Most species would go extinct within the first few decades of their creation. Hesbrix saw most of these creatures go because of natural selection, but some were completely wiped out because of careless mutations. Hesbrix saw no one do this more than Mutran, and he despised Mutran because of this. Hesbrix became more distant from the Rahi after the Makuta evolution. Upon realizing this Hesbrix left the Brotherhood, and devoted his life to the preservation of Rahi. Hesbrix wore the Kanohi Faxon, but when he left the Brotherhood the switched to the Volitak.
Miserix didn't see Hesbrix's abandonment as a threat. He let Hesbrix live, but Miserix did officially exile Hesbrix from the Brotherhood.
Hesbrix helped create the Archives by giving the Matoran information and catching some of the more dangerous Rahi. Because of this, Hesbrix formed a liking to Onu-Matorans, he found their love for Rahi admirable. He aided in the creation of the Archives not only to give future generation factual information on Rahi, but also in case the Brotherhood went out of control with mutation there would still be some pure DNA to continue the many species.
After hearing about what Teridax had done to end the Matoran Civil War, Hesbrix raced to Destral. When Hesbrix arrived he asked Miserix what is to be done about Teridax. Miserix responded with, "I have taken measures to prevent future wars. Now let me tell you what you are going to do. You are going to turn around, run away, and never show your face to me again. And if I even think about you, I will find you, tare you into pieces, and feed you to my Visorak." It was then Hesbrix found out how far the Brotherhood had fallen.