The Gamer in 40k

Gerhard Valkyrie was born in 979.M41, on an Imperial Hive-world. He regains his memories of a past life in the same year that it was overrun by Orks under a Warboss using as much dakka as they could get their hands on. All alone and isolated, forced to fight against the now resident Orks for survival, Gerhard is unwilling to accept such a fate of constant war and sets out to advance on his own. Thanks to a special power, he became the Gamer, and thanks to that, Gerhard now has a real chance. Chaos and the Xenos better hurry, because the Gamer has entered the Grim Dark Future of the 41st Millennium, and he is here to stay. — Description from novelcodex.org