Concept: “The omnipresent skeleton is one of those foes that GMs can always toss at the adventurers when stuck for an idea.”   
Content: "stats for two new undead monsters as well as customization tools and a small table of encounters.” 
Writing: Exemplary skeleton mechanics, and a detailed variety of ways to get boned. 
Art/design: Full-color undead illustrations in a crisp black and yellow folder layout. 
Usability: A skeletal framework that’s easy to read and reference