Probably the most potent poison known, Morgurth was a black liquid refined from the venom and/or blood of greater drakes by an alchemical ritual which usually included distillation with strong alcohol in the presence of powdered gold or platinum; it then had to be protected from sunlight in a glass or ceramic container. Morgurth dissolved the victim's brain; at minimum, it caused a long coma (1-100 years).
Note: Morgurth was both a nerve poison and a reduction poison, requiring two separate antidotes.Dúrad slowed the effected of morgurth; Laurrë-Lily was a specific antidote.