For listings of monsters, see Bestiary.
Monster is the official term for an attackable character or being that is not player-controlled. A monster can range from a rat to Vorago. Monsters are often fought by players for training, entertainment, and loot. Killing monsters is one of the most popular activities in RuneScape. Nearly all monsters drop remains.
While some monsters will never begin a fight with a player, many high level creatures are aggressive, potentially causing unwanted death. If a player has over double the combat level of the monster, the monster will be docile, and will only attack when provoked. However, in areas such as the Wilderness, most monsters are indefinitely aggressive. As a rule of thumb, "humanoids" are not aggressive towards players except in some cases when the humanoid's nature or occupation has malign or criminal connotations (i.e. Black Knight, Zombie, Mugger). Most cities are also safe from aggressive monsters, though the perimeter or surroundings may not be as secure. On April 19 2011, most of the monsters' sounds were updated.
- Most monsters are NPCs with a combat level and attack option (Not including random event characters)
- The combat level of monsters is calculated in a similar way to a player's combat level
- Melee monsters will follow you if you try to get away during fighting
- Ranged and magic monsters will follow you only if you try to get away from missile range, or behind a wall.
- Some monsters will retreat if their health gets too low
- Melee monsters will chase you if attacked far away
- Monsters will retreat if the attacker moves out of patrol range
- Monsters will not even react at all if the attacker is too far to be seen (mostly happens if attacking the monster with ranged or magic.)
- All monsters can get stuck at walls and obstacles (Revenants are an exception to this, who don't get stuck behind walls unless targeting a player)
- For larger monsters, the monster's active spot is on the south-western corner of the monster, meaning that this spot will be following you in combat; it is also where the monster's drop will appear after it dies. However, the rest of their body can become stuck behind objects.
- Unlike players, monsters can regenerate health while in combat.