Player Modifiers
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Player Modifiers are various bonuses and penalties that are received from a number of different sources such as
obstacles.
Mechanics
Modifiers of the same kind stack additively. For example, if a player who has unlocked
(+3% Global Mastery XP) and is wearing an 
Ancient Ring of Mastery (+7% Global Mastery XP) will receive a total of +10% Global Mastery XP.
Any penalties are subtracted from bonuses of the same type to get the total modifier. For example, if the above player also constructs a
obstacle (-6% Global Mastery XP), their Global Mastery XP modifier will instead be +4%.
Additive vs Multiplicative
When describing how different bonuses stack, the terms 'additive' and 'multiplicative' are often used to explain how to combine them.
When two bonuses stack additively, the combined bonus is the sum of the first bonus and and the second bonus. For example, if a +10% bonus and a +20% bonus stack additively, the combined bonus will be +30%.
[math]\displaystyle{ \small{\begin{aligned} \text{Additive Bonus} = \text{Base Value} * (1 + (\text{Bonus 1} + \text{Bonus 2}) / 100)\end{aligned}} }[/math]
When two bonuses stack multiplicatively, the combined bonuses is instead
[math]\displaystyle{ \small{\begin{aligned} \text{Multiplicative Bonus} = \text{Base Value} * (1 + \text{Bonus 1} / 100) * (1 + \text{Bonus 2}/ 100) \end{aligned}} }[/math]
If the same +10% bonus and +20% bonus stack multiplicatively instead, the combined bonus will be +32%. If both bonuses are positive (or if both are negative) and they stack multiplicatively, the combined effect will be larger than if they stacked additively.
Combining Similar Modifiers
When multiple modifiers affect the same stat, they are usually applied additively. In particular, more specific versions of a bonus will stack additively with the global version of that bonus.
An example of this would be the Global Mastery XP and Skill Mastery XP modifiers, so a player wearing an Ancient Ring of Mastery (+7% Global Mastery XP) who also has reached the 10% Mastery Pool Checkpoint for
(+5% Agility Mastery XP) will receive a total of +15% Agility Mastery XP.
This also applies to combat modifiers of the same type such as Ranged Accuracy Rating and Global Accuracy Rating.
Nearly all buffs in the game stack additively.
List of Modifiers
The following list does not contain all possible bonuses, and although all of the below bonuses are defined in-game there may be some that are not currently in use.
| Modifier | Example Text | Notes |
|---|---|---|
| Global Accuracy | ERROR: No modifier found with ID: increasedGlobalAccuracy ERROR: No modifier found with ID: decreasedGlobalAccuracy |
Applies to the player's Accuracy Rating for all combat styles |
| Melee Accuracy Bonus | ERROR: No modifier found with ID: increasedMeleeAccuracyBonus ERROR: No modifier found with ID: decreasedMeleeAccuracyBonus |
Applies to the player's Melee Accuracy Rating |
| Ranged Accuracy Bonus | ERROR: No modifier found with ID: increasedRangedAccuracyBonus ERROR: No modifier found with ID: decreasedRangedAccuracyBonus |
Applies to the player's Ranged Accuracy Rating |
| Magic Accuracy Bonus | ERROR: No modifier found with ID: increasedMagicAccuracyBonus ERROR: No modifier found with ID: decreasedMagicAccuracyBonus |
Applies to the player's Magic Accuracy Rating |
| Melee Evasion | ERROR: No modifier found with ID: increasedMeleeEvasion ERROR: No modifier found with ID: decreasedMeleeEvasion |
Applies to the player's Melee Evasion Rating |
| Ranged Evasion | ERROR: No modifier found with ID: increasedRangedEvasion ERROR: No modifier found with ID: decreasedRangedEvasion |
Applies to the player's Ranged Evasion Rating |
| Magic Evasion | ERROR: No modifier found with ID: increasedMagicEvasion ERROR: No modifier found with ID: decreasedMagicEvasion |
Applies to the player's Magic Evasion Rating |
| Damage Reduction | ERROR: No modifier found with ID: increasedDamageReduction ERROR: No modifier found with ID: decreasedDamageReduction |
An additive bonus (or penalty) to the player's Damage Reduction. |
| Melee Strength Bonus | ERROR: No modifier found with ID: increasedMeleeStrengthBonus ERROR: No modifier found with ID: decreasedMeleeStrengthBonus |
Despite having the same name, this is different from the Melee Strength Bonus on equipment. Instead, this modifier directly applies to the player's Melee Max Hit. |
| Ranged Strength Bonus | ERROR: No modifier found with ID: increasedRangedStrengthBonus ERROR: No modifier found with ID: decreasedRangedStrengthBonus |
Despite having the same name, this is different from the Ranged Strength Bonus on equipment. Instead, this modifier directly applies to the player's Ranged Max Hit. |
| Magic Damage Bonus | ERROR: No modifier found with ID: increasedMagicDamageBonus ERROR: No modifier found with ID: decreasedMagicDamageBonus |
Despite having the same name, this is different from the Magic Damage Bonus on equipment.
This modifier is combined multiplicatively with the Magic Damage Bonus on equipment as part of determining the player's Magic Max Hit |
| Max Hit Percent | ERROR: No modifier found with ID: increasedMaxHitPercent ERROR: No modifier found with ID: decreasedMaxHitPercent |
This modifier applies to the player's Max Hit. It is applied before Max Hit Flat and stacks multiplicatively with Melee Strength Bonus, Ranged Strength Bonus, and Magic Damage Bonus.
Post-Roll Modifiers will still apply after damage is actually dealt, potentially amplifying the effect. |
| Max Hit Flat | ERROR: No modifier found with ID: increasedMaxHitFlat ERROR: No modifier found with ID: decreasedMaxHitFlat |
Directly increases or decreases the player's max hit by the listed amount and is applied after all other modifiers to max hit.
Post-Roll Modifiers will still apply after damage is actually dealt, potentially amplifying the effect. |
| Damage to All Monsters | ERROR: No modifier found with ID: increasedDamageToAllMonsters ERROR: No modifier found with ID: decreasedDamageToAllMonsters |
A Post-Roll Modifier that increases the player's damage when attacking any monster. It stacks additively with any other applicable "Damage To..." modifiers. |
| Damage to Combat Area Monsters | ERROR: No modifier found with ID: increasedDamageToCombatAreaMonsters ERROR: No modifier found with ID: decreasedDamageToCombatAreaMonsters |
A Post-Roll Modifier that increases the player's damage when attacking monsters found in Combat Areas. It stacks additively with any other applicable "Damage To..." modifiers. |
| Damage to Slayer Monsters | ERROR: No modifier found with ID: increasedDamageToSlayerAreaMonsters ERROR: No modifier found with ID: decreasedDamageToSlayerAreaMonsters |
A Post-Roll Modifier that increases the player's damage when attacking monsters found in Slayer Areas. It stacks additively with any other applicable "Damage To..." modifiers. |
| Damage to Dungeon Monsters | ERROR: No modifier found with ID: increasedDamageToDungeonMonsters ERROR: No modifier found with ID: decreasedDamageToDungeonMonsters |
A Post-Roll Modifier that increases the player's damage when attacking monsters found in Dungeons. It stacks additively with any other applicable "Damage To..." modifiers.
If fighting a monster also found in non-Dungeon areas, this modifier will not apply. |
| Damage to Slayer Tasks | ERROR: No modifier found with ID: increasedDamageToSlayerTasks ERROR: No modifier found with ID: decreasedDamageToSlayerTasks |
A Post-Roll Modifier that increases the player's damage when attacking their current Slayer Task. It stacks additively with any other applicable "Damage To..." modifiers.
This modifier will apply if fighting the player's current slayer target in a dungeon, although it won't count towards completing the Slayer Task. |
| Monster Respawn Timer | ERROR: No modifier found with ID: decreasedMonsterRespawnTimer ERROR: No modifier found with ID: increasedMonsterRespawnTimer |
Adds or subtracts from the base 3 second timer to spawn a new monster. |
| Slayer Coins | ERROR: No modifier found with ID: increasedSlayerCoins ERROR: No modifier found with ID: decreasedSlayerCoins |
Affects how many Error creating thumbnail: File missing Slayer Coins are received when killing monsters for the player's Error creating thumbnail: File missing Slayer task.
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| GP From Monsters Flat | ERROR: No modifier found with ID: increasedGPFromMonstersFlat ERROR: No modifier found with ID: decreasedGPFromMonstersFlat |
Adds or subtracts from how much Error creating thumbnail: File missing GP is received from killing a monster. Applied before (and thus boosted by) the GP Global and GP From Monsters modifiers.
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| GP From Thieving Flat | ERROR: No modifier found with ID: increasedGPFromThievingFlat ERROR: No modifier found with ID: decreasedGPFromThievingFlat |
Adds or subtracts from how much Error creating thumbnail: File missing GP is received from Error creating thumbnail: File missing Thieving. Applied before (and thus boosted by) the GP Global and GP From Thieving modifiers.
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| GP Global | ERROR: No modifier found with ID: increasedGPGlobal ERROR: No modifier found with ID: decreasedGPGlobal |
Affects how much Error creating thumbnail: File missing GP is received from sources other than selling (including Error creating thumbnail: File missing Item Alchemy). Stacks additively other non-flat GP modifiers.
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| GP From Monsters | ERROR: No modifier found with ID: increasedGPFromMonsters ERROR: No modifier found with ID: decreasedGPFromMonsters |
Affects how much Error creating thumbnail: File missing GP is received from killing a monster. Stacks additively with the GP Global modifier.
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| GP From Thieving | ERROR: No modifier found with ID: increasedGPFromThieving ERROR: No modifier found with ID: decreasedGPFromThieving |
Affects how much Error creating thumbnail: File missing GP is received from Error creating thumbnail: File missing Thieving. Stacks additively with the GP Global modifier.
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| GP From Agility | ERROR: No modifier found with ID: increasedGPFromAgility ERROR: No modifier found with ID: decreasedGPFromAgility |
Affects how much Error creating thumbnail: File missing GP is received from Error creating thumbnail: File missing Agility. Stacks additively with the GP Global modifier.
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| Chance To Double Items Global | ERROR: No modifier found with ID: increasedChanceToDoubleItemsGlobal ERROR: No modifier found with ID: decreasedChanceToDoubleItemsGlobal |
Applies to the chance to receive twice as many items from any source, including all skills as well as monster drops. Stacks additively with Chance To Double Loot and Chance To Double Items Skill modifiers. |
| Chance To Double Loot Combat | ERROR: No modifier found with ID: increasedChanceToDoubleLootCombat ERROR: No modifier found with ID: decreasedChanceToDoubleLootCombat |
Applies to the chance to receive twice as many items from monster drops, including bones and chests from Dungeons. Stacks additively with Chance To Double Items Global |
| Chance To Double Items Skill | ERROR: No modifier found with ID: increasedChanceToDoubleItemsSkill ERROR: No modifier found with ID: decreasedChanceToDoubleItemsSkill |
Applies to the chance to receive twice as many items from the listed skill. Stacks additively with Chance To Double Items Global. |