In the fifth part of the Lessons in Monster Design series, I'll discuss monsters' special abilities. In my opinion, special abilities are one of the most important parts of a monster entry. They're the only thing that really tests the author's rules-fu.
It's important to remember that in the various bestiaries there are many perfectly good creatures that wouldn't make the top 5 in Here Be Monsters or advance in RPG Superstar. The orc, for instance, is a fantasy staple and it's absolutely necessary for such creatures to exist in RPGs. However, in a contest you want to show off your ability to create mechanically interesting creatures. You need special abilities that do more than just keep the monster conscious at negative hp. You need to include something unique that sets the monster apart from other monsters and shows your creativity, mojo, and rules-fu.