Chased out of their ancestral home, Nelson and his family fled to Agurts. It was a tough childhood for the young man, who was often bullied for his black skin. But he grew up strong, fast, and smart. When he came of age, he signed up for the Agurtan military to win his full citizenship. He was stationed in the snowy Tritan mountains as a member of the newly formed Tritan Guard of the 55th Viking Shield Team. It was here that the marauders and Omangan spies learnt to fear the coming of the hunter they named the Snow Leopard. From the town streets to the mountain tops, Nelson defends his new homeland with the fervor of a man who knows what it means to be homeless.

年幼的尼爾森和他的家人被趕出故鄉，逃難到亞格斯。因為膚色，他的童年過得十分艱難，經常受到欺凌，但這也讓他變得更強壯、更敏捷、更聰明。成年後，為了獲得正式公民身份，他加入了亞格斯軍隊，作為第55維京雪域部隊新組建的特里安衛兵中的一員，駐守在雪虐風饕的特里安山脈。尼爾森深知無家可歸意味著什麼，他充滿熱誠地捍衛著新家園每一寸土地。掠劫者和奧曼加間諜將尼爾森稱為「雪豹」，因為尼爾森帶給他們的恐懼深深種入腦海，成為了揮之不散的陰影。