Defence is a skill that makes enemies less likely to hit a player and deal zero damage. It also allows for players to wear better armour. To train the defence skill, a player must first select a defensive or controlled style of fighting, and then engage in combat with an enemy.
As a player's defence level increases, they will be able to wear more effective armour. Below is a table showing the various basic armours a player can wear and at what levels.
Barrows' Brother Armour2
1Also requires 50 strength
2Ahrim's and Karil's armours also require 70 magic and 70 ranged, respectively