Weakness

OS

Weakness is what describes a monster's and/or player's vulnerabilities in combat. Whatever a monster's weakness is, is the best possible style of combat with which to approach the fight. If a monster is weak to a particular style, that style will be more effective than other styles. However, every other style of the same class is usually also effective. A monster's weakness can be discovered by looking at the combat interface; its weakness will be displayed next to its name.

Affinity

Main article: Affinity

The main effect of weakness is to describe the affinities of the monster to each style, which in turn affects the hit chance of attacks against it. A higher affinity means a higher hit chance.

In general, the combat triangle is followed: a monster with a specific weakness (e.g. slash) is also fairly weak to other attacks in the same class (e.g. melee), has average resistance to hits of the class with disadvantage to their weakness (e.g. ranged), and has high resistance to the class with advantage to their weakness (e.g. magic). It is also common that weaknesses are based on the monster's combat style.

Only the specific weakness (e.g. slash) has any affect on affinity - all other specific styles (e.g. stab, air, bolts, etc.) are treated as their class only.

Weakness	Affinity	Examples
Specific weakness	90
Weakness class	65
Neutral class	55
Resistant class	45

Monsters with no weakness commonly have 55 affinity to everything, though boss monsters are a common exception.

Player weakness

Players do not have specific weaknesses, nor any displayed weaknesses. Their actual affinities are determined by what they are wearing, represented in their Loadout interface as "style bonus".

List of weaknesses

Weakness	List of monsters
Nothing	Weak to nothing
Melee	Weak to melee attacks
Crush	Weak to crush attacks
Slash	Weak to slash attacks
Stab	Weak to stab attacks
Ranged	Weak to ranged attacks
Arrows	Weak to arrows
Bolts	Weak to bolts
Thrown	Weak to thrown weapons
Magic	Weak to magic attacks
Air spells	Weak to air spells
Water spells	Weak to water spells
Earth spells	Weak to earth spells
Fire spells	Weak to fire spells

Special weaknesses

Some monsters have weaknesses to specific weapons or attacks. These do not always affect affinity - sometimes they directly increase hit chance, sometimes they increase weapon accuracy.

Special weaknesses are Members only, except "Silverlight".

Weakness	Targets	Notes
Silverlight	Demons (full list)	Acts as the monster's weakness, as well as gaining increased hit chance and damage. Darklight has a further increased bonus and can be upgraded.
Keris	Kalphites and scabarites (full list)	Increased hit chance and damage.
Balmung	Dagannoth (full list)	Increased hit chance and damage.
Ancient Magicks	Muspah (full list)	Doubled damage.
Gadderhammer	Shades (full list)	Increased damage and accuracy.
Salve amulet	Undead (full list)	Increased accuracy and damage.
Blisterwood	Vampyres (full list)	Increased accuracy and damage.
Bane	Dragons, abyssal demons, wallasalki, or basilisks (full list)	Specifically tuned to one of the above types. Increased hit chance and damage.
Holy water	Demons (full list)	Increased hit chance and damage.
Brutal arrows	Zogres (full list)	Ignores the 75% damage reduction zogres have against other attacks.