Tome of Warlocks

Publisher's blurb: Tome of Warlocks contains 20 premade characters that can be used by players or as NPCs by Dungeon Masters. Levels 1-20, are represented. How were ability scores generated? Ability scores were generated using the 4d6 method (with actual dice!). In instances where more than one score was below 10, the lowest score was rerolled. Did you use feats? No, for the sake of consistency Ability Score Improvement was used instead of feats. What races are represented? Humans are the only race represented in the initial offerings, though future supplements will include other races.