Defence is one of the seven Combat skills in Melvor Idle. It is one of three skills (along with Hitpoints and Prayer) that is always used when determining a player or monster's Combat Level regardless of what combat style they are strongest with.
Training Defence increases the player's evasion ratings, which in turn lowers monsters' chance to hit when in combat. However, a higher player Defence level does not reduce the maximum damage dealt by a successful monster attack, instead see: Damage Reduction.
The Defence skill increases the player's melee, ranged, and magic evasion rating. For details on how Evasion Rating is calculated, refer to the Evasion Rating section on the Combat page.
Gaining Defence XP
Defence experience can be earned while using any Combat Style by selecting the appropriate Attack Style:
While using Ranged, select the Longrange Attack Style
While using Magic, select the Defensive Attack Style
XP gained is based on damage dealt. When using the Block Attack Style, 0.4 Defence XP will be received per point of damage done. When using the Longrange or Defensive Attack Styles, 0.2 Defence XP will be received per point of damage done, with another 0.2 XP going to Ranged or Magic respectively.
Each armour material requires a certain Defence level to be equipped. Below is a table detailing which Defence level is required for which armour material.
Combat skills in Melvor Idle. It is one of three skills (along with 
Hitpoints and 
Prayer) that is always used when determining a player or monster's Combat Level regardless of what combat style they are strongest with.
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Melee, select the Block Attack Style
Ranged, select the Longrange Attack Style
Magic, select the Defensive Attack Style
Gold Emerald Ring increases all combat XP gained by 4%.
Level
Bronze
Iron
Slayer (Basic)
Steel
Black
Mithril
Adamant
Slayer (Strong)
Rune
Ice
Miolite
Dragon
Slayer (Elite)
Sand Treaders
Recoil Shield
Ancient
Dragonfire Shield
Slayer (Master)
Terran
Ragnar
after the player reaches 
Superior Defence Skillcape
