The Making of Original Dungeons and Dragons: 1970-1976 is a piece of history rather than a sourcebook. Wizards calls it a “retrospective historical book” which, thanks to the help of gaming historian ...
So it helps to pick something easy, but also fun. Wizards are famously fragile in Dungeons & Dragons. They have the smallest hit dice to quantify their HP and, by default, they don't get any armor ...