When Wrath was scavenging old Weyrloc Hospital he found a tunnel and followed it and found a secret way to Urdnot female camp. What happened next is unknown but in a year a krogan was born. He was born from both infected with genophage, though Wrath was almost pure. In 2210 Urdnot Wrex asked him about his rite of passage. He agreed. Ryker was the only one to not attend this. Other krogan never liked him. In his rite of passage not one but two trasher maws spawned out of Tuchanka. Ryker was able to kill both of them. After it he was granted respect from each single one in Urdnot Camp. After that Wrath met him and recruited him. Now the unstoppable killing machine was set on loose.