OSRS Drop Calculator › Cosmic rune

Best way to farm Cosmic rune

All 77 monsters that drop Cosmic rune, ranked by realistic quantity per hour — not just drop rate. Change the seconds-per-kill for any monster to match your own speed. 4 other sources aren’t ranked; see why below.

Drop data: Cosmic rune on the OSRS Wiki

Currently fastest method
Gangster
1,055 / hr
Monster Drops (rarity · quantity) Avg/kill Sec/kill Kills/hr Qty/hr
Gangster
Combat lvl 45–50
20/256 · 30–60
 3.52 12 300 1,055
Gang boss
Combat lvl 76–83
20/256 · 30–60
 3.52 20 180 633
Sarachnis
Combat lvl 318
5/100 · 125–150
 6.88 71 51 349
Abyssal Sire
Combat lvl 350 · Slayer 85
4/139 · 350
 10.07 117 31 310
Sergeant Strongstack
Combat lvl 141
8/127 · 25–30
 1.73 31 116 201
Sergeant Steelwill
Combat lvl 142
8/127 · 25–30
 1.73 34 106 183
Skeleton (Lucien's camp)
Combat lvl 132
6/120 · 12
 0.6 12 300 180
Skeleton (Shayzien Crypts)
Combat lvl 132
6/120 · 12
 0.6 12 300 180
Zombie (Shayzien Crypts)
Combat lvl 132
6/120 · 12
 0.6 12 300 180
Sergeant Grimspike
Combat lvl 142
8/127 · 25–30
 1.73 36 100 173
Tortured gorilla
Combat lvl 141–142
76/1,000 · 20–30
 1.9 45 80 152
Scarab Mage
Combat lvl 66–119
2/128 · 35
 0.547 15 240 131
Araxyte (Level 146)
Combat lvl 146 · Slayer 92
5/127 · 14–24
 0.748 21 171 128
Corporeal Beast
Combat lvl 785
17/512 · 500
 16.6 573 6 104
Necromancer (Great Kourend)
Combat lvl 68
3/65 · 10–15
 0.577 20 180 104
Bandosian guard
Combat lvl 125
5/128 · 20
 0.781 29 124 97
Phosani's Nightmare
Combat lvl 1024
4/100 · 247–420
 13.34 514 7 93
Ogress Shaman
Combat lvl 82
5/116 · 10–15
 0.539 21 171 92
Ogress Warrior
Combat lvl 82
5/116 · 10–15
 0.539 21 171 92
Araxyte (Level 96)
Combat lvl 96 · Slayer 92
5/127 · 7–12
 0.374 15 240 90
Locust rider
Combat lvl 68–106
2/128 · 35
 0.547 22 164 89
Armadylean guard
Combat lvl 97
5/128 · 20
 0.781 32 112 88
Undead Druid
Combat lvl 105
3/100 · 20–30
 0.75 31 116 87
Armoured zombie (Zemouregal's Fort)
Combat lvl 105
~3/128 · 15–30
 0.527 22 164 86
Ancient Zygomite
Combat lvl 109 · Slayer 57
6/118 · 15
 0.763 34 106 81

Other sources (not ranked)

These also drop it but aren’t included in the ranking above. The reason is shown for each.

Monster Drops (rarity · quantity) Avg/kill Why not ranked
Zalcano
Combat lvl 336
1/36 · 295–926
 16.96 Skilling boss, taken down with Mining, Smithing and Runecraft rather than combat, so it isn't ranked against monster kills
Dreadborn Araxyte
Combat lvl 281 · Slayer 92
5/127 · 14–24 (3 rolls)
 2.24 Superior: only appears randomly (~1 in 200 kills) while on a slayer task
Screaming twisted banshee
Combat lvl 144 · Slayer 15
3/128 · 20 (3 rolls)
 1.41 Superior: only appears randomly (~1 in 200 kills) while on a slayer task
Screaming banshee
Combat lvl 70 · Slayer 15
3/128 · 2 (3 rolls)
 0.141 Superior: only appears randomly (~1 in 200 kills) while on a slayer task
How this is calculated: items/hr = (3600 ÷ seconds per kill) × average items per kill. Each monster's drop lines are listed as the wiki shows them (rarity · quantity); the average adds them all up, each as rarity × average quantity × rolls — so a guaranteed drop plus a rarer bonus drop both count. Drop rates and quantities come from the OSRS Wiki's community-verified drop tables. Seconds-per-kill is an editable estimate based on each monster's hitpoints and defence — your real speed depends on your stats and gear, so adjust it and your edits are remembered on this device. Rates marked ~ are approximate on the wiki.

Something wrong on this page?

Drop rates come from the OSRS Wiki and kill times are estimates, so mistakes happen. Tell us what's off and it'll be looked at.