Cost Reduction

Cost Reduction is a mechanic that reduces the cost of an action. Costs are rounded up to the nearest integer. This means if there is a base cost of 5 items, it would require 20% cost reduction to reduce the costs down to 4. An overall cost increase of just 1% would increase the cost to 6.

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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Township
Township Boosts
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Cooking
Cooking Boosts
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Smithing
Smithing Boosts
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Fletching
Fletching Boosts
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Crafting
Crafting Boosts
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Runecrafting
Runecrafting Boosts
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Herblore
Herblore Boosts
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Agility
Agility Boosts
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Summoning
Summoning Boosts
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Alt. Magic
Alt. Magic Boosts