Pure essence: where to get it

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Source	Quantity	Chance per roll
Abyssal demon (Standard)	60	5/128
Abyssal demon (Wilderness Slayer Cave)	60	5/68
Abyssal guardian	1	36/256
Abyssal guardian	1	34/256
Abyssal guardian	5	4/256
Abyssal guardian	10	4/256
Abyssal guardian	15	4/256
Abyssal leech	1	36/256
Abyssal leech	1	34/256
Abyssal leech	5	4/256
Abyssal leech	10	4/256
Abyssal leech	15	4/256
Abyssal Sire (Phase 1)	600	5/139
Abyssal walker	1	36/256
Abyssal walker	1	34/256
Abyssal walker	5	4/256
Abyssal walker	10	4/256
Abyssal walker	15	4/256
Ancient chest	1–65,535	1/33, 2 rolls
Ancient Custodian	30	12/124, 3 rolls
Ancient Wizard (Mage)	25	7/50
Ankou (Regular)	15	5/100
Araxxor (In combat)	1,200	1/115
Armoured zombie (Melee)	20–50	12/128
Armoured zombie (Zemouregal's Fort)	20–50	11/128
Banshee	13	22/128
Blood Reaver (Ancient Prison)	23	8/128
Brassican Mage	25	7/50
Brimstone chest	3,000–6,000	1/60
Catablepon (Level 49)	15	5/101
Cerberus	300	5/130
Chaos Fanatic	250	2/128
Corporeal Beast	2,500	21/512
Dagannoth Prime	150	5/128
Duke Sucellus	200–300	1/100
Elder custodian stalker	30	12/124
Essence impling	20	1/10
Essence impling	35	1/100
Essence impling jar	20	1/10
Essence impling jar	35	1/100
Extra supply crate	20–70	1/180
Fever spider	100–200	2/36
Gargoyle (Upstairs)	150	6/128
Greater abyssal demon	60	5/128, 3 rolls
Intricate pouch	500–1,000	1/45
Juvenile custodian stalker	15	12/160
Larran's big chest	4,500–7,500	3/60
Larran's small chest	3,041–5,989	3/60