The focus on the Black Legion itself makes it stand out. It gives a detailed look at their motives, their hierarchy, and their way of life. This is different from other 40k novels that might focus on different factions. Also, the action scenes are really well - written, making it exciting for a new reader to the series.
The unique perspective of 'Black Legion' is what sets it apart as a first 40k novel. It shows the chaos and destruction that the Black Legion brings, which is a core aspect of the Warhammer 40k universe. It has a good blend of character development, world - building, and action. The way it portrays the dark and menacing nature of the Black Legion, while also exploring their internal politics and rivalries, is very interesting. It gives a new reader a comprehensive view of one of the most important and feared elements in the 40k lore.
One of the things that makes 'Black Legion' stand out as a first 40k novel is its ability to introduce the complex lore of Warhammer 40k in an accessible way. It doesn't assume you know everything about the universe. It slowly unfolds the history and nature of the Black Legion, which is part of the larger tapestry of the 40k world. The characters are also very engaging, with their own personalities and goals that drive the story forward.