Monsters are the creatures of the Ragnarok world that players can kill in order to gain experience to level up. Each monster has its own AI, and some will react differently to players than others. When monsters are killed, the player killing them receives experience, and one or more items may be dropped by the monster. Each monster has an Element, a Size, and a Race, which the player can take advantage of using appropriate gear, skills, and items. Some monsters are also considered Bosses or MVPs. Not all monsters fall under the no-Kill Stealing rule. Some are considered Free for All.