The Illegitimate Son in Red Cloak

An illegitimate child born in the snow. His uncle and all his subordinates died in battle on the day he was born. However, he and his mother miraculously survived incognito. Until the end, the sharp blades and magic that once tried to harm him were all used against him. The red cloak originally referred to the terror of harvesting life, but now he is the overlord who conquers the world.