Blightweed

Blightweed is a species of plant found exclusively in locales that have been tainted with demonic miasma, most abundantly in the Underdeep Blightlands. It is a tough grass-like plant with reddish blades and black veins running through it.

Uses in alchemy

Despite its speculated origin being rooted in corruption of local flora by demonic miasma, it does not have any corruptive properties. However, it is poisonous by itself and is more often used as an ingredient in poisons rather than potions, though with the correct treatment it has been found to increase mental focus in subjects who have ingested it.