Large blunt necronium salvage: where to get it

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Source	Quantity	Chance per roll
'Rum'-pumped crab []	2	1/1,092,266.67
Aberrant spectre []	2	1/1,398,101.33
Abomination []	2	1/68,266.67
Abyssal beast []	2	1/51,200
Abyssal demon []	2	1/102,400
Abyssal demon []	2	1/68,266.67, 3 rolls
Abyssal demon []	2	1/2,202,009.6
Abyssal lord []	2	1/34,133.33
Abyssal savage []	2	1/68,266.67
Acheron mammoth []	2	1/68,266.67
Adamant dragon []	2	1/40,960
Ahoeitu the Chef (Normal mode) []	2	1/102,400
Air elemental []	2	1/5,592,405.33
Airut []	2	1/97,814.93
Alanogard the Black (Normal mode) []	2	1/102,400
Alexis []	2	1/44,739,242.67
Anagami (Normal mode) []	2	1/102,400
Ancient mage []	2	1/5,592,405.33
Ancient mage []	2	1/2,202,009.6
Ancient ranger []	2	1/3,728,270.22
Ancient ranger []	2	1/2,202,009.6
Ancient warrior []	2	1/3,728,270.22
Ancient warrior []	2	1/2,202,009.6
Angry barbarian spirit []	2	1/5,373,952
Animated book (Dragonkin Laboratory) (Normal mode) []	2	1/102,400
Ankou []	2	1/1,864,135.11
Ankou []	2	1/815,559.11, 3 rolls
Aquanite []	2	1/170,666.67
Aquanite []	2	1/68,266.67, 3 rolls
Arhat (Normal mode) []	2	1/102,400
Arhat paragon (Normal mode) []	2	1/102,400
Armadylean shaman []	2	1/798,915.05
Armoured zombie (Defender of Varrock) []	2	1/11,184,810.67
Armoured zombie (Normal mode) []	2	1/102,400
Arrg (Scratched) []	2	1/2,236,962.13
Astellarn (Normal mode) []	2	1/102,400
Automaton (Heart of Gielinor) []	2	1/2,167,057.07
Automaton champion []	2	1/2,114,628.27
Automaton Generator []	2	1/1,966,080
Automaton Guardian []	2	1/1,966,080
Automaton Tracer []	2	1/1,966,080
Aviansie []	2	1/3,728,270.22
Bandit []	2	Very rare
Bandit Brawler (Melee) []	2	1/3,728,270.22
Bandosian wild mage []	2	1/798,915.05
Barbarian (Longhouse) []	2	1/11,184,810.67
Barbarian (Regular) []	2	1/11,184,810.67
Basilisk []	2	1/1,398,101.33