Revenant drop enhancer: where to get it

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Source	Quantity	Chance per roll
Abyssal beast []	1	1/2,101
Abyssal demon []	1	1/2,551
Abyssal demon []	1	1/2,336
Abyssal lord []	1	1/1,880
Abyssal savage []	1	1/2,252
Acheron mammoth []	1	1/1,908
Black demon []	1	1/2,551
Black demon []	1	1/2,155
Black dragon []	1	1/2,500
Blue dragon []	1	1/3,378
Chest (Rogues' Castle) []	1	Very rare
Dragonstone dragon []	1	1/2,101
Gargoyle []	1	1/2,381
Greater demon []	1	1/3,049
Greater demon []	1	1/2,717
Greater demon ash lord []	1	1/1,678
Greater demon berserker []	1	1/1,572
Green dragon []	1	1/3,968
Hellhound (Level 105) []	1	1/2,381
Hellhound (Level 92) []	1	1/2,717
Hydrix dragon []	1	1/1,880
Ice strykewyrm []	1	1/2,358
Kal'gerion demon []	1	1/1,984
Lava strykewyrm []	1	1/2,174
Muddy chest []	1	Very rare
Onyx dragon []	1	1/1,984
Revenant cyclops []	1	1/4,167
Revenant dark beast []	1	1/2,232
Revenant demon []	1	1/2,976
Revenant dragon []	1	1/1,984
Revenant goblin (16) []	1	1/15,625
Revenant goblin (19) []	1	1/13,158
Revenant goblin (22) []	1	1/11,364
Revenant goblin (28) []	1	1/8,929
Revenant hellhound []	1	1/3,571
Revenant hobgoblin []	1	1/5,682
Revenant icefiend []	1	1/6,757
Revenant imp []	1	1/17,857
Revenant knight []	1	1/2,101
Revenant ork []	1	1/2,551
Revenant pyrefiend []	1	1/6,250
Revenant vampyre []	1	1/5,319
Revenant werewolf []	1	1/4,717
Ripper Demon []	1	1/1,908
Rogue Captain (Pickpocketing) []	1	1/25,000
Soulgazer []	1	1/1,953
Soulgazer []	1	1/1,852
Veil-ripper Ozharakha []	1	1/1,852