Brimstone key: where to get it

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Source	Quantity	Chance per roll
Aberrant spectre	1	1/82
Abhorrent spectre	1	Always
Abyssal demon (Standard)	1	1/76
Abyssal Sire (Phase 1)	1	1/40
Adamant dragon	1	1/53
Ahrim the Blighted	1	1/100
Alchemical Hydra (Serpentine)	1	1/40
Amoxliatl (Post-quest)	1	1/54
Ancient Wyvern	1	1/62
Ancient Zygomite	1	1/79
Ankou (Regular)	1	1/225
Araxxor (In combat)	1	1/40
Artio	1	1/56
Aviansie	1	1/292
Baby black dragon (Normal)	1	1/157
Baby blue dragon	1	1/640
Baby red dragon (1)	1	1/640
Basilisk	1	1/323
Basilisk Knight	1	1/64
Basilisk Sentinel	1	Always
Berry (Awake)	1	1/268
Black demon (Regular)	1	1/86
Black dragon (Regular)	1	1/75
Blood-starved venator	1	Always
Bloodveld (Normal)	1	1/172
Blue dragon	1	1/98
Brine rat	1	1/224
Bronze dragon (Standard)	1	1/94
Brutal black dragon	1	1/45
Brutal blue dragon (Catacombs of Kourend)	1	1/66
Brutal red dragon	1	1/63
Callisto	1	1/50
Calvar'ion (Normal)	1	1/68
Cave kraken (Cave kraken)	1	1/76
Cerberus	1	1/45
Chaos Elemental	1	1/59
Chaos Fanatic	1	1/80
Chilled jelly	1	1/78
Choke devil	1	Always
Colossal Hydra	1	Always
Commander Zilyana	1	1/50
Crazy archaeologist	1	1/80
Dagannoth (Level 74 (1))	1	1/235
Dagannoth (Level 88)	1	1/128
Dagannoth (Level 90)	1	1/120
Dagannoth fledgeling	1	1/280
Dagannoth Prime	1	1/60
Dagannoth Rex	1	1/60