From publisher blurb:

Miserable Wrecking Wreckers includes 20 Named Foes with unique abiliites and descriptors to drop into your campaign and torment your players!

-New Character Class: The Lowlife. Special abilities allow them cheat at dice rolls, steal bonuses and even Luck Points from other characters, and smooth things over when their own party is about to skin them alive! This one is for those players who live to mess with others at the table because, after all, everybody deserves a little love...

-New Descriptor Table to modify "stock" Monsters.

-3 New Monster Types

-Playable Species! Play as a Ratling, Raven, Gato, or Mongrel while still choosing a Character Class!