Over 30+ families of monsters to capture and train as your loyal pets.
Dynamically changing world and terrain.
Den system where you can play with your pets, hang out with friends, record your journeys and decorate to your heart's content.
Strategic Battles - Utilize your pets' strength and minimize it's weaknesses and be victorious!
Dueling system - Player versus Player or Pet versus Pet.
Pet AI system - Your pet actually learns from you and from pervious battles.
Mate your favorite pets to produce offsprings. Babies inherits the trait of it's parents.
Pet may send email or SMS (text) messages to their owner's cellphones.
Constant evolving world -- terrain and passable routes may change from time to time. Like the appearance or disappearance of dungeons, landscape, etc.
A blog system -- Events inside the game, and various information can be used to generate a blog instantly which can be viewed on the internet. Even non-players will see what is going on inside the game.