Astrology
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 can be re-rolled by spending 
Stardust or 
Golden Stardust.
| This page was last updated for (v1.0.1). |
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Mechanics
Modifiers
When unlocked, each constellation will initially have a single standard modifier star unlocked. Increasing the 
Mastery level of a constellation will unlock additional stars (and therefore additional modifiers), up to a maximum of 3 standard modifiers and 3 unique modifiers per constellation.
Each modifier will start with a random modifier and value out of the possible modifiers available for that constellation, where the list of possible modifiers for a constellation can be viewed either within the constellations table or in-game by clicking Explore followed by View Possible Modifiers on the constellation.
Rerolling Modifiers
Modifiers can be re-rolled in order to change both the modifier its self and value of the modifier. Re-rolling standard modifiers costs Stardust, while re-rolling unique modifiers costs Golden Stardust. The cost of re-rolling always applies and cannot be avoided with preservation chance modifiers. For any constellation, re-rolling may be performed for all standard or unique modifiers at the same time at a cost of 1 stardust per roll, or individually at the cost of 30 stardust per roll. The cost of re-rolling modifiers individually may be halved to 15 stardust when the player reaches the 95% Mastery pool checkpoint.
When rolled, the value of each modifier is a random whole number between 1 and 5 inclusive, with larger values being less common than lower values. The chance of rolling each value can be found in the Reroll Chances section of this page.
Due to the low chance of rolling a modifier with a value of 5 re-rolling all modifiers until each has the maximum value of 5 is discouraged, as doing so would require a significant amount of both Stardust and Golden Stardust. Instead, consider the following strategy:
- Decide on a minimum acceptable value (say 3% or 4%).
- Re-roll all standard or unique modifiers until at least one of the modifiers is one that is desirable to the player with at least minimum acceptable value.
- Individually re-roll the other standard or unique modifiers until they also become modifiers that the player desires with the minimum acceptable value. Ideally, individual re-rolling should only occur after the 95% Mastery pool checkpoint has been reached due to the significant stardust saving this will bring.
Acquiring Stardust
Both Stardust and Golden Stardust are exclusively obtained from Astrology. Both are acquired at random while studying constellations, where Stardust and Golden Stardust drops with a 1% and 0.20% chance per action respectively.
The rate at which stardust may be acquired by:
- Decreasing the action interval - The
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, maximising the 
Herblore preservation and doubling chances before creating any of these potions is highly recommended. - Increasing the drop chance
- For Stardust, the 25% Mastery pool checkpoint provides a +1% bonus to the drop chance, for a maximum chance of 2%.
- For Golden Stardust, the 50% Mastery pool checkpoint provides a +0.2% bonus, and
Astro provides a +0.1% bonus to the drop chance, for a maximum chance of 0.5%.
- For
- Increasing the drop quantity - Equipping the
Astrology Skillcape provides a +1 bonus to the quantity of both Stardust and Golden Stardust that is dropped.
Mastery Unlocks
Item Mastery Unlocks
| Level | Unlock |
|---|---|
| 20 | Unlock another Star (Unique Modifier) |
| 40 | Unlock another Star (Standard Modifier) |
| 60 | Unlock another Star (Unique Modifier) |
| 80 | Unlock another Star (Standard Modifier) |
| 99 | Unlock another Star (Unique Modifier) |
Mastery Pool Checkpoints
| Pool % | Pool XP | Bonus |
|---|---|---|
| 10% | 800,000 xp | +5% Astrology Mastery XP for Melvor Realm only |
| 25% | 2,000,000 xp | +5% chance to gain Stardust in Astrology |
| 50% | 4,000,000 xp | +3% chance to gain Golden Stardust in Astrology |
| 95% | 7,600,000 xp | +2% chance to locate a Meteorite in Astrology +2% chance to gain Golden Stardust in Astrology |
| Total Mastery Pool XP | 8,000,000 | |
Skillcape
The skillcape can be purchased from the store for 1,000,000
after the player reaches 
Level 99.
Regular Skillcape
The Astrology Skillcape is the skillcape for the Astrology skill. It can be purchased for 1,000,000 from the Shop once the player reaches Level 99 in the Astrology skill. The Astrology Skillcape offers the following benefits when worn:
+1 base quantity when gaining Stardust from Astrology and +1 base quantity when gaining Golden Stardust from Astrology
Superior Skillcape
The 
Superior Astrology Skillcape is the superior skillcape for the Astrology skill. It can be purchased for 10,000,000 from the Shop once the player reaches Level 120 in the Astrology skill. Level 120 can only be reached if the player owns the 
Throne of the Herald expansion. Likewise, the superior skillcape can only be purchased if the player owns this expansion. The superior skillcape offers the following benefits when worn:
+2 base quantity when gaining Stardust from Astrology, +2 base quantity when gaining Golden Stardust from Astrology, and -10% Astrology Interval
Pet
The pet can be unlocked by doing any Astrology action.
| Pet | Name | DLC | Effect |
|---|---|---|---|
| | Astro |  | +1% chance to gain Golden Stardust in Astrology |
Constellations
The bonuses listed below are the maximum possible. The actual value will between 1 and 5. The chance of each result can be found in the Reroll Chances section of this page.
| Constellation | Level | DLC | XP | Skills | Standard Stars | Unique Stars | |||
|---|---|---|---|---|---|---|---|---|---|
| Level | Modifiers | Level | Modifiers | ||||||
 | Deedree | 1 | | 5 |  Woodcutting Farming | 1 | +8% Woodcutting Skill XP +8% Farming Skill XP | 20 | +5% chance to gain Bird Nest in Woodcutting |
| 40 | +8% Woodcutting Mastery XP +8% Farming Mastery XP | 60 | +5% base primary resource quantity gained in Farming | ||||||
| 80 | +8% Chance to Double Items in Woodcutting +8% Chance to Double Items in Farming | 99 | +5% chance to gain Stardust from Magic Tree in Woodcutting (Quantity equal to primary skill resource quantity) | ||||||
 | Iridan | 10 | | 13 |  Attack Smithing | 1 | +8% Accuracy Rating +8% Attack Skill XP | 20 | +5 Hidden Attack Level |
| 40 | +8% Smithing Mastery XP +8% Smithing Skill XP | 60 | -5% Smithing Interval | ||||||
| 80 | +8% Chance to Double Items in Smithing | 99 | +5% of Maximum Hit added to Minimum Hit | ||||||
 | Ameria | 20 | | 21 |  Fishing Firemaking | 1 | +8% Fishing Skill XP +8% Firemaking Skill XP | 20 | +5% chance to receive Special Items from Fishing |
| 40 | +8% Fishing Mastery XP +8% Firemaking Mastery XP | 60 | -5% Fishing Interval -5% Firemaking Interval | ||||||
| 80 | +8% Chance to Double Items in Fishing +8% Chance to Double Items in Firemaking | 99 | +5% chance to gain 1 Diamond from Firemaking (Cannot be doubled) | ||||||
 | Terra | 30 | | 29 |  Strength Mining | 1 | +8% Accuracy Rating +8% Strength Skill XP | 20 | +5 Hidden Strength Level +5% Melee Strength Bonus from Equipment |
| 40 | +8% Mining Mastery XP +8% Mining Skill XP | 60 | +5% Chance to receive gems from Mining (Does not work for Rune Essence) | ||||||
| 80 | +8% Chance to Double Items in Mining | 99 | +5% chance to deal no damage to Essence Nodes in Mining +5% chance to deal no damage to Ore Nodes in Mining | ||||||
 | Vale | 40 | | 37 |  Hitpoints Cooking | 1 | +8% Accuracy Rating +8% Hitpoints Skill XP | 20 | -5% Cooking Interval |
| 40 | +8% Cooking Mastery XP +8% Cooking Skill XP | 60 | +5% Lifesteal | ||||||
| 80 | +8% Chance to Double Items in Cooking | 99 | +5% Food Healing Value +5% Chance to Preserve Food when eaten | ||||||
 | Nysa | 45 |  | 41 |  Archaeology Cartography | 1 | +8% Archaeology Skill XP +8% Cartography Skill XP | 20 | -5 dig site map refinement cost |
| 40 | +8% chance to preserve dig site map excavation actions | 60 | -5% Cartography survey interval | ||||||
| 80 | +8% Archaeology Mastery XP | 99 | +5% Chance to Double Items in Archaeology +5% Chance to Double Items in Cartography | ||||||
 | Syllia | 50 | | 45 |  Ranged Fletching | 1 | +8% Accuracy Rating +8% Ranged Skill XP | 20 | +5 Hidden Ranged Level +5% Ranged Strength Bonus from Equipment |
| 40 | +8% Fletching Mastery XP +8% Fletching Skill XP | 60 | +5% Ammo Preservation | ||||||
| 80 | +8% Chance to Double Items in Fletching | 99 | +5% Chance to gain +1 additional resource in Fletching (Cannot be doubled) | ||||||
 | Arachi | 60 | | 53 |  Magic Runecrafting | 1 | +8% Accuracy Rating +8% Magic Skill XP | 20 | +5 Hidden Magic Level +5% Magic Damage Bonus from Equipment |
| 40 | +8% Runecrafting Mastery XP +8% Runecrafting Skill XP | 60 | +5% Rune Preservation for Alt. Magic Spells | ||||||
| 80 | +8% Chance to Double Items in Runecrafting | 99 | +5% Chance to receive random Elemental Runes from Runecrafting when creating Runes | ||||||
 | Ko | 70 | | 61 | Agility Thieving | 1 | +8% Thieving Skill XP +8% Agility Skill XP | 20 | -5% Thieving Interval -5% Agility Interval |
| 40 | +8% Thieving Mastery XP +8% Agility Mastery XP | 60 | +5% GP gained from Agility | ||||||
| 80 | +8% Chance to Double Items in Thieving | 99 | +50 Stealth while Thieving | ||||||
 | Tellus | 80 | | 69 |  Defence Slayer | 1 | +8 Hidden Defence Level +8% Defence Skill XP | 20 | +5% Global Slayer Coins (except Item Sales) |
| 40 | +8% Slayer Skill XP | 60 | +5% Damage to Monsters in Slayer Areas | ||||||
| 80 | +8% GP from Combat | 99 | +5% Reflect Damage | ||||||
 | Hyden | 90 | | 77 |  Prayer Crafting | 1 | +8% Prayer Skill XP | 20 | -5% Crafting Interval |
| 40 | +8% Crafting Mastery XP +8% Crafting Skill XP | 60 | +5% Chance to gain +1 additional resource in Crafting (Cannot be doubled) | ||||||
| 80 | +8% Chance to Double Items in Crafting | 99 | +5% Chance To Preserve Prayer Points | ||||||
 | Qimican | 95 | | 85 |  Summoning Herblore | 1 | +8% Herblore Skill XP +8% Summoning Skill XP | 20 | -5% Herblore Interval -5% Summoning Interval |
| 40 | +8% Herblore Mastery XP +8% Summoning Mastery XP | 60 | +5% Chance To Preserve Potion Charge | ||||||
| 80 | +8% Chance to Double Items in Herblore +8% Chance to Double Items in Summoning | 99 | +5% Chance to preserve Summoning Charges | ||||||
 | Variel | 100 | | 155 | Astrology | 1 | +8% Astrology Skill XP | 20 | -5% Astrology Interval |
| 40 | +8% Astrology Mastery XP for Melvor Realm only | 60 | +2.5% chance to gain Golden Stardust in Astrology | ||||||
| 80 | +2% chance to gain Stardust in Astrology | 99 | +0.5% chance to locate a Meteorite in Astrology | ||||||
 | Haemir | 105 | | 235 |  Township | 1 | +8% Township Skill XP | 20 | +5% Township Happiness |
| 40 | +8% Township Resource Generation | 60 | -5% Township Building Cost (Capped at -80%) | ||||||
| 80 | +8% Township Max Storage | 99 | +5% Township Education | ||||||
 | Rosaniya | 110 | | 335 | Woodcutting Fishing Firemaking Cooking Mining Smithing Farming Thieving Fletching Crafting Runecrafting Herblore Agility Summoning Astrology Township | 1 | +8% chance to receive a Quality Superior Gem while Mining Gem Veins or Meteorite Ore | 20 | +5% Global GP (except Item Sales) |
| 40 | +8% Chance to Double Items Globally | 60 | +50 Bank Space | ||||||
| 80 | +4% chance to gain Stardust in Astrology | 99 | +5% Mastery XP for Melvor Realm only | ||||||
 | Ashtar | 115 | | 475 | Attack Strength Defence Hitpoints Ranged Magic Prayer Slayer | 1 | +8% Auto Eat Efficiency | 20 | -5% Attack Interval |
| 40 | +8% Damage To Slayer Tasks | 60 | +5% Flat Slayer Area Effect Negation | ||||||
| 80 | +8% Chance To Double Loot in Combat | 99 | Gives the enemy: -5% Damage Reduction | ||||||
Reroll Chances
Whenever a bonus from a Constellation is rolled or re-rolled, the value of the bonus will be between 1 and 5. The odds of rolling each value are listed below: Template:AstrologyValueTable
Potion
The Secret Stardust Potion reduces the interval for Study actions.
| Secret Stardust Potion | |||
|---|---|---|---|
| Potion | Tier | Charges | Effect |
 | I | 5 | -3% Astrology Interval |
 | II | 10 | -5% Astrology Interval |
 | III | 15 | -10% Astrology Interval |
 | IV | 25 | -15% Astrology Interval |
Skill Boosts
This table lists most sources of Astrology-specific modifier boosts. For a list of boosts that apply to all skills, see the Skill Boosts page. This list does not contain boosts provided from Mastery rewards.
| Source | Type | DLC | Astrology Boosts | Other Modifiers |
|---|---|---|---|---|
| Waterfall | Agility Obstacle 10 | | -5% Astrology Interval +5% Astrology Skill XP +5% Astrology Mastery XP | |
| Forest Climb | Agility Obstacle 14 | | -10% Astrology Interval | -6% Global Skill XP +1.5% chance to gain Stardust in Astrology +0.5% chance to gain Golden Stardust in Astrology |
| Variel | Constellation | | -5% Astrology Interval +8% Astrology Skill XP | +8% Astrology Mastery XP for Melvor Realm only +2.5% chance to gain Golden Stardust in Astrology +2% chance to gain Stardust in Astrology +0.5% chance to locate a Meteorite in Astrology |
| Secret Stardust Potion I | Item | | -3% Astrology Interval | |
| Secret Stardust Potion II | Item | | -5% Astrology Interval | |
| Secret Stardust Potion III | Item | | -10% Astrology Interval | |
| Secret Stardust Potion IV | Item | | -15% Astrology Interval | |
 Astrology Lesser Relic | Item (Consumable) | | -5% Astrology Interval | +2% chance to gain Golden Stardust in Astrology -3 Prayer Point Cost for Prayers |
 Owl | Item (Summon1, Summon2) | | -5% Astrology Interval | |
 Star Gazing Body | Item (Platebody) | | +2% Astrology Skill XP | |
 Star Gazing Boots | Item (Boots) | | +2% Astrology Skill XP | |
 Star Gazing Hat | Item (Helmet) | | +2% Astrology Skill XP | |
 Star Gazing Leggings | Item (Platelegs) | | +2% Astrology Skill XP | |
 Superior Astrology Skillcape | Item (Cape) | | -10% Astrology Interval | +2 base quantity when gaining Stardust from Astrology +2 base quantity when gaining Golden Stardust from Astrology |
 Superior Cape of Completion | Item (Cape) | | -10% Astrology Interval | +8 additional quantity of Runes gained in Runecrafting (Cannot be doubled) +15 Flat HP Regen +5% of Maximum Hit added to Minimum Hit -75% Prayer Point Cost for Prayers -20% Township Building Cost (Capped at -80%) -30% Melvor Realm Agility Obstacle Build Costs +5% Melee Strength Bonus from Equipment +2 base quantity when gaining Stardust from Astrology +2 base quantity when gaining Golden Stardust from Astrology +1 base quantity when gaining Bird Nest from Woodcutting +20% chance to avoid the stun interval and damage in Thieving when failing a pickpocket attempt for {realmName} only +4% Global Perfect Cook chance +2 Coal Ore per Ore Mined. (Item doubling does not apply) +100% chance to successfully Cook an item +5% Ranged Strength Bonus from Equipment +10% Global Slayer Coins (except Item Sales) +150% GP gained from Thieving +20% GP gained from Agility +100% Chance to gain +1 additional resource in Fishing (Cannot be doubled) +100% Chance to gain +1 additional resource in Fletching (Cannot be doubled) +15% Chance to gain +1 additional resource in Crafting (Cannot be doubled) +100% Chance to gain +1 additional resource in Herblore (Cannot be doubled) +50% chance to gain +1 additional resource in Smithing for Bars nodes (Cannot be doubled) +270 Stealth while Thieving +100% chance to gain Charcoal in Firemaking +100% chance to gain Coal Ore in Firemaking +100% chance to gain Ash in Firemaking +10% Summoning Max Hit Rune providing items provide 4x as many runes +40% base primary resource quantity gained in Farming +5% Lifesteal +5% Magic Damage Bonus from Equipment +1% chance to gain 1 Lost Chest from Fishing for Melvor Realm only (Cannot be doubled) +8% Damage To Slayer Tasks +75% Ammo Preservation -75% Coal Costs for Smithing +20% Chance to Double Items in Farming +25% Chance to Double Items in Runecrafting -0.8s Thieving Interval -0.8s Crafting Interval +1 base primary resource quantity gained in Fletching for Gem-Tipped Bolts nodes +10 base primary resource quantity gained in Summoning for Melvor Realm only +15% Chance to preserve Summoning Charges +35% Flat Slayer Area Effect Negation +5% Chance To Preserve Prayer Points Bypass All Slayer Area item requirements +25% Chance to Preserve Resources in Summoning +5% Chance To Preserve Potion Charge -20% Woodcutting Interval -25% Cooking Interval -10% Summoning Interval +5% Reflect Damage -20% Agility Pillar build costs +5% Chance to Preserve Food when eaten +5% Chance to find gem veins when Mining +8% Global Skill XP +10% Rune Preservation x2 Items received from Fishing x2 Items received from Fletching x2 Items received from Herblore |
 Superior Max Skillcape | Item (Cape) | | -10% Astrology Interval | +8 additional quantity of Runes gained in Runecrafting (Cannot be doubled) +15 Flat HP Regen +5% of Maximum Hit added to Minimum Hit -75% Prayer Point Cost for Prayers -20% Township Building Cost (Capped at -80%) -30% Melvor Realm Agility Obstacle Build Costs +5% Melee Strength Bonus from Equipment +2 base quantity when gaining Stardust from Astrology +2 base quantity when gaining Golden Stardust from Astrology +1 base quantity when gaining Bird Nest from Woodcutting +20% chance to avoid the stun interval and damage in Thieving when failing a pickpocket attempt for {realmName} only +4% Global Perfect Cook chance +2 Coal Ore per Ore Mined. (Item doubling does not apply) +100% chance to successfully Cook an item +5% Ranged Strength Bonus from Equipment +10% Global Slayer Coins (except Item Sales) +150% GP gained from Thieving +20% GP gained from Agility +100% Chance to gain +1 additional resource in Fishing (Cannot be doubled) +100% Chance to gain +1 additional resource in Fletching (Cannot be doubled) +15% Chance to gain +1 additional resource in Crafting (Cannot be doubled) +100% Chance to gain +1 additional resource in Herblore (Cannot be doubled) +50% chance to gain +1 additional resource in Smithing for Bars nodes (Cannot be doubled) +270 Stealth while Thieving +100% chance to gain Charcoal in Firemaking +100% chance to gain Coal Ore in Firemaking +100% chance to gain Ash in Firemaking +10% Summoning Max Hit Rune providing items provide 4x as many runes +40% base primary resource quantity gained in Farming +5% Lifesteal +5% Magic Damage Bonus from Equipment +1% chance to gain 1 Lost Chest from Fishing for Melvor Realm only (Cannot be doubled) +8% Damage To Slayer Tasks +75% Ammo Preservation -75% Coal Costs for Smithing +20% Chance to Double Items in Farming +25% Chance to Double Items in Runecrafting -0.8s Thieving Interval -0.8s Crafting Interval +1 base primary resource quantity gained in Fletching for Gem-Tipped Bolts nodes +10 base primary resource quantity gained in Summoning for Melvor Realm only +15% Chance to preserve Summoning Charges +35% Flat Slayer Area Effect Negation +5% Chance To Preserve Prayer Points Bypass All Slayer Area item requirements +25% Chance to Preserve Resources in Summoning +5% Chance To Preserve Potion Charge -20% Woodcutting Interval -25% Cooking Interval -10% Summoning Interval +5% Reflect Damage -20% Agility Pillar build costs +5% Chance to Preserve Food when eaten +5% Chance to find gem veins when Mining +8% Global Skill XP +10% Rune Preservation x2 Items received from Fishing x2 Items received from Fletching x2 Items received from Herblore |
 Sign of the Stars | Upgrade | | -10% Astrology Interval |
| Melvor Idle version v1.3 (Released: 13th June 2024) | ||||||||||||||||||||
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| Reference Tables: Items, Equipment, Experience Table, Upgrading Items, Combat Areas, Slayer Areas, Dungeons, Strongholds, The Abyss, Monsters |
