Astrology is a skill that provides passive buffs to various other skills in the game similar to the Agility skill.
Modifiers will be unlocked as you level up your mastery in each constellation, and the buff can be upgraded by spending Stardust or Golden Stardust to level up that buff to a maximum level of 5 for Golden Stardust buffs and 8 for Stardust buffs.
Leveling Astrology involves Studying various Constellations, starting with the Deedree Constellation at level 1. Studying has a base interval of 3 seconds per action. Studying does not cost any resources and provides Astrology experience and Mastery experience for the Constellation after each action.
Training Roars/Test is the primary way of obtaining Stardust and the only way to obtain Golden Stardust. Both are acquired at random while studying constellations, where Stardust and Golden Stardust drops with a 5% and 2% chance per action respectively.
Stardust can also be obtained in small quantities from Cutting or BurningMagic Logs - see the respective pages for more information.
Both types of Stardust can be obtained in set quantities from Township Tasks.
The rate at which stardust may be acquired can be increased by:
Decreasing the action interval
Secret Stardust Potion reduces the action interval by 3/5/10/15% depending on the potion's tier. Note that since the potions themselves use Stardust as an ingredient, maximizing the Herblore preservation and doubling chances before creating any of these potions is highly recommended.
Each Constellation starts with 6 predetermined Stars (modifiers) that are unlocked by increasing the Mastery Level of the Constellation. Upgrading Stars that provide standard modifiers costs Stardust, while upgrading Stars that provide unique modifiers costs Golden Stardust. The modifier starts at 0, so you need to use the appropriate type of Stardust to benefit from a Stars' modifiers.
The maximum amount of upgrades you can put into a Star modifier is determined by the type of modifier. Normal modifiers can go up to level 8, whereas unique modifiers can only go up to level 5. Each upgrade gives a linear increase to the bonus.
The first upgrade requires 10 Stardust or 50 Golden Stardust. With each upgrade, the cost of Stardust or Golden Stardust will double, resulting in the last upgrade of a star costing 1,280 Stardust or 800 Golden Stardust. Each standard modifier requires 2,550 Stardust to max out, while each unique modifier requires 1,550 Golden Stardust to max out. This results in the following total cost by expansion:
Despite the wording Unique Modifier, the modifiers do stack with similar types of modifiers, e.g. Deedree's Mastery Level 60 star (up to +5% Farming Yield) stacks with the +3% Farming Yield from Bob's Gloves
Skill boosts are special enhancements that improve the efficiency and effectiveness of the player's skills. These boosts can come from a variety of sources such as equipment, potions, pets, and masteries. Global boosts are boosts which apply across all skills. A boost can be assumed to be for the listed skill only, unless specifically stated it is a global boost. Boosts help the player to progress faster and achieve higher levels of mastery in each skill. The following are some common types of skill boosts and what they do:
Increased Skill XP: Increases the amount of experience points (XP) gained.
Decreased Skill Interval: Reduces the time it takes to complete skilling actions, allowing the player to perform more actions in a given period.
Preservation Chance: Increases the likelihood that resources or items used during skill actions are not consumed.
Increased Chance to Double Items: Gives a higher chance of receiving double the items or resources when performing skill-related actions.
Increased Mastery XP: Enhances the rate at which mastery XP is gained for a skill.
For more information on general skill boosts that apply to all skills, refer to the Skill Boosts page.