Decay personality in depth:
Decay due to the self imposed segregation among his clan has developed antisocial behaviors as both a defense mechanism and a "normal" way of life. Solitary, Decay prefers to be left alone and is aggressive toward those that disturb him during private times, even more so if they continue. Instinctually driven, the combination of the lack of human empathy makes him often act with very little care or thought of consequences.
Out to survive for himself, he left the clan and began to attempted to make a minor success in a civilized setting. Though his personality often drove folks away from him and his venture failed. Racism, a catalyst in his past to fast track him to his anti-social lifestyle. Spurred by agressive anti-racist themese, Decay does not favor humanoids that aren't like himself. It has even grown to the point that Decay has an elitist mindset. He pictures himself higher than humanity due to the simple fact that he knows he is an animal and doesn't deny it. He views people as self decievers saying they are better than animal, yet animal won't fight other animals for greed.
His love for animal pelts and skins is sort of like a trophy and homage to his jaded ideals. A celelbration of beast that feed him. The exact opposite to this is the practice of magic known as Voiding. Learned through gifted slaves whom he befriended in a strange mutual relationship is Decay's hatred. It is his power to make things simply not exist in this world. Like a forgotten memory, nothing left behind to trophy, just simply gone. Morals and rules do not apply to Decay, such things created by the "broken" mankind means little to him. He doesn't seek rewards from society or adhering to societal rules just for status.