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Grimm Liquid is a mysterious substance capable of spawning Creatures of Grimm.
Pools of this black tar-like substance appear in numbers in the Land of Darkness. The Wyvern also showed the ability to exude the substance from its skin. When droplets of the substance impacted the ground, lesser forms of Grimm, including Creeps, Beowolves, Sabyrs, and Ursai rose from the black liquid.
The liquid is first seen in "Battle of Beacon" when the Wyvern secretes some of it. When it hits the ground many Grimm spawn from it.
In "The Lost Fable" it is revealed that the God of Darkness resided in a pool of Grimm Liquid before leaving Remnant. Salem threw herself in the pool in her last attempt at taking her life, but as she was immortal it instead transformed her into the being of darkness that she is now.
- In a deleted concept for Volume 1, Corsac and Fennec Albain would have used the Grimm Liquid to summon Grimm in the Beacon Academy Initiation.
- According to The World of RWBY: The Official Companion, a deleted concept states the Grimm essence could be bottled up in vials, and later sold to the black market, in which one could "Grimm-ify" animals as well as merge them together into a blasphemous hybrid.