Ajax had been attacked by a group of Hilichurls. After running from home, he had fallen into the abyss and had been saved by his now mentor—Skirk. She had taught him many survival skills and more importantly, how to fight. He's still being cared for by her, but she had tested him by putting him in the woods to see if he could fight by himself. Being so closed off after his experiences in  the Abyss, he had little trust for anyone besides Skirk and his former family. 