OSRS Drop Calculator › Cosmic rune

Cosmic rune

Best way to farm Cosmic rune

All 79 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
Combat lvl 45–50
20/256 · 30–60
 3.52 12 300 1,055
Combat lvl 76–83
20/256 · 30–60
 3.52 20 180 633
Combat lvl 318
5/100 · 125–150
 6.88 71 51 349
Combat lvl 350 · Slayer 85
4/139 · 350
 10.07 117 31 310
Combat lvl 141
8/127 · 25–30
 1.73 31 116 201
Combat lvl 142
8/127 · 25–30
 1.73 34 106 183
Combat lvl 132
6/120 · 12
 0.6 12 300 180
Combat lvl 132
6/120 · 12
 0.6 12 300 180
Combat lvl 132
6/120 · 12
 0.6 12 300 180
Combat lvl 142
8/127 · 25–30
 1.73 36 100 173
Corrupted Hunllef defeated
1/24 · 175–250 (3 rolls)
 26.56 600 6 159
Combat lvl 141–142
76/1,000 · 20–30
 1.9 45 80 152
Combat lvl 66–119
2/128 · 35
 0.547 15 240 131
Combat lvl 146 · Slayer 92
5/127 · 14–24
 0.748 21 171 128
Crystalline Hunllef defeated
1/24 · 160–240 (2 rolls)
 16.67 514 7 117
Combat lvl 785
17/512 · 500
 16.6 573 6 104
Combat lvl 68
3/65 · 10–15
 0.577 20 180 104
Combat lvl 125
5/128 · 20
 0.781 29 124 97
Combat lvl 1024
4/100 · 247–420
 13.34 514 7 93
Combat lvl 82
5/116 · 10–15
 0.539 21 171 92
Combat lvl 82
5/116 · 10–15
 0.539 21 171 92
Combat lvl 96 · Slayer 92
5/127 · 7–12
 0.374 15 240 90
Combat lvl 68–106
2/128 · 35
 0.547 22 164 89
Combat lvl 97
5/128 · 20
 0.781 32 112 88
Combat lvl 105
3/100 · 20–30
 0.75 31 116 87

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
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
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
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
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 per hour = kills per hour × average items per kill.

Average items per kill adds up every drop line as the wiki shows it (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 drop tables; rates marked ~ are approximate on the wiki. "via" means the item comes inside another drop, like red spiders' eggs in Sarachnis's giant egg sac.

Kill times are estimates, worked out the same way for every monster from its hitpoints and defence. Add your RuneScape name in Preferences and they're worked out from your own combat levels instead. We can't see your gear or include boss mechanics, so expect individual times to be off; what matters is how the monsters compare. You can type your own time for any monster: it's remembered on this device for every page (↺ goes back to the default), and shared anonymously to help improve the estimates (privacy).

Achievement diaries that improve a drop rate or quantity can be ticked in Preferences.

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.