Blood rune: where to get it

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Source	Quantity	Chance per roll
Pyrefiend []	1–100	Common
Red dragon [{'content': 'In free-to-play worlds, this drop is replaced by main hand or off-hand rune darts.'}]	2	4/128
Reward box []	—	Unknown
Reward casket (hard) []	75	1/20
Ripper Demon []	30–50	8/128
Sack of very wild rewards []	100–200	74/13,694, 2 rolls
Sandy Casket []	75	Unknown
Sandy Casket (red) []	75	Unknown
Sanguine crawler []	1–2	4/128
Saradomin wizard []	8	12/128
Scabaras lancer []	7	4/128
Scabaras mage []	7	4/128
Scabaras ranger []	7	4/128
Scarab mage []	5	4/128
Scutarius []	90–110	600/6,427
Security casket (CS Week) []	75	Common
Shadow warrior []	2	6/128
Shiny columbarium key []	20	9/200
Silver key black []	10–29	6/153
Silver key brown []	1–30	Rare
Silver key crimson []	1–30	Rare
Silver key purple []	10–29	6/153
Silver key red []	1–30	Rare
Silverquill, the Dreadhog []	10–15	Common
Sir Carl []	1	1/128
Sir Harry []	1	1/128
Sir Jerro []	1	1/128
Skeletal hand []	1	14/2,316
Skeletal Wyvern []	2–11	4/128
Skeleton (Tarn's Lair) (High level) []	3	3/128
Skeleton brute []	3	3/123
Skeleton heavy []	3	3/123
Skeleton hero []	3	3/123
Skeleton thug []	3	3/123
Skeleton warlord []	3	3/123
Slasher Demon []	30–50	8/128, 3 rolls
Soldier []	2	1/128
Spectral attendant []	1	1/10
Spectral cultivator []	1	1/10
Spectral worshipper []	1	1/10
Spellwisp []	2	1/128
Thalassus []	16	Unknown
The Barrows Brothers [{'content': 'If the random number lies between 755 and 879, inclusive.'}]	37–43	Common, 7 rolls
Throwing muspah []	20	125/1,024
TokHaar-Mej []	15	1/7
Tormented demon []	8–44	14/256
Tormented wraith []	7	25/512
Tower guard []	2	1/128