Plaguewolt is a potent ingested poison.
It is a rare and murderous substance created by the Forsaken.
In World of Warcraft
This article or section includes speculation, observations or opinions possibly supported by lore or by Blizzard officials. It should not be taken as representing official lore.
[Zraedus' Brew], used in the quest  Nothing But The Truth, is most likely plaguewolt, though it could be just any poison.