Monsters are the enemies that players fight to gain experience. Almost every single Field and Dungeon contains them. In The World, Monsters appear out of Magic Portals
Monsters change from Area to Area , and also change when you go to a different root town. Get creative, we admins will too. I'd be boring if a big ball of goo was all you ever stabbed.
Boss monsters usualy appear at the bottom of a dungen, just before the statue, or durring an event. The better the reward, the stronger the monster. So keep that in mind when you go roaming around!