The last in my sprint to technically have 52 books before the end of CBR16. The Warhammer 40k rulebook is an absolute slog; too wordy in the creative parts, too difficult to grasp all the rules until you’ve lost a bunch of games in a row. Don’t bother unless you’re allergic to time and money.
Warhammer 40k Core Rulebook 10th edition
Warhammer 40k Core Rulebook 10th edition by Games Workshop