Double Loot

There are several effects in the game that provide a bonus to the player's chance to receive Double Loot from slain Monsters or

This page is up to date (v1.3.1).
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Thieving

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Mechanics

By default, the player has a 0% chance to receive double loot. All equipped items and other effects that increase the double loot chance are added together to get the player's total chance to receive double loot.

For example, if the player has one item equipped that gives a +10% chance to receive double loot and another that gives a +5% chance to receive double loot, their total chance to receive double loot is 15%.

The chance to double loot does not apply to   Mastery Tokens,   Mysterious Stones,   Circlet of Rhaelyx,   Jewel of Rhaelyx,   Signet Ring Half (a), or   Signet Ring Half (b).

Combat

Any item received as loot from combat has a chance of being doubled, including bones and chests,   Fire Cape,   Infernal Cape, and   Infernal Core from completing Dungeons. The roll is made once per drop - Bone drops can be doubled without the item drop being doubled, and the opposite is also true. If the drop would consist of a stack of multiple items, one roll will be made to determine whether or not the entire stack is doubled.

Thieving

The additional chance to double items in Thieving is based on stealth and NPC perception, double items can therefore be guaranteed from stealth alone if the player's stealth is at least four times the NPC's perception.

Any item pickpocketed has a chance of being doubled, including   Bobby's Pocket,   Chapeau Noir,   Sneak-Ers, and Area/NPC Unique drops.

Sources

For a list of boosts that apply to all skills, see the Skill Boosts page.

Skill Page
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Farming
Farming Boosts
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Woodcutting
Woodcutting Boosts
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Fishing
Fishing Boosts
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Firemaking
Firemaking Boosts
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Cooking
Cooking Boosts
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Runecrafting
Runecrafting Boosts
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Herblore
Herblore Boosts
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Summoning
Summoning Boosts
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Astrology
Astrology Boosts
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Alt. Magic
Alt. Magic Boosts
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Cartography
Cartography Boosts
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Archaeology
Archaeology Boosts
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Harvesting
Harvesting Boosts