Artorias of Grimgar

When a boy wakes up in a dark room with a bunch of other kids in varying physical structure with no memory, just what will happen. While the other come together to form two groups, he goes it alone. Becoming a dark knight and facing the land of Grimgar alone he continuously runs into the other two groups who continuously try to get him on their side being as he got his official badge in less than two day. What happens when he remember someone, someone named Artorias of the abyss? and what happens when he tries to become him?