Grimy irit: where to get it

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Source	Quantity	Chance per roll
'Rum'-pumped crab []	1	1/200
Aberrant spectre []	2–3	1/34.1
Abyssal beast []	2	1/30
Abyssal demon []	1	1/403.2
Abyssal lord []	4	1/60
Abyssal savage []	1	1/25
Afflicted []	1	1/89
Air elemental []	1	1/146.3
Airut []	4	12/400
Al Kharid warrior []	1	1/89
Alchemist's chest []	2	1,012/34,362
Alexis []	1	1/4,096
Ancient mage []	1	1/204.8
Ancient mage []	1	1/403.2
Ancient ranger []	1	1/204.8
Ancient ranger []	1	1/403.2
Ancient warrior []	1	1/204.8
Ancient warrior []	1	1/403.2
Angry barbarian spirit []	1	1/393.6
Anja []	1	1/89
Ankou []	1	1/113.8
Aquanite []	1	12/128
Aquanite []	3	11/60, 3 rolls
Arcane apoterrasaur []	5	Common
Armoured zombie (Defender of Varrock) []	1	1/47.6
Arrg (Scratched) []	1	1/136.5
Automaton (Heart of Gielinor) []	1	1/396.8
Automaton champion []	1	1/387.2
Automaton Generator []	4	1/1,440
Automaton Guardian []	4	1/1,440
Automaton Tracer []	4	1/1,440
Aviansie []	1	1/136.5
Bag of lost items []	18	Uncommon
Bagrada rex []	5	Common
Bandit []	1	1/146.3
Bandit []	1	Rare
Bandit Brawler (Melee) []	1	1/55.4
Bandit looter []	1	1/102.4
Banshee []	1	1/68.3
Basilisk []	1	1/128
Berry []	1	1/136.5
Berserk barbarian spirit []	1	1/393.6
Black demon []	1	8/128
Black demon []	1	8/128
Black Guard (Forgiveness of a Chaos Dwarf) []	1	1/1,024
Black Guard Berserker []	1	1/512
Black Guard crossbowdwarf []	1	1/1,024
Black Heather []	1	1/136.5