Karmethia is a hub of Sarion science and experimentation. The Chemists of this city have been experimenting on various insect species using a mutagenic stone called Athite. Their meddling has produced unusually large and aggressive hybrid anthropods, which they plan to use as living weapons.
In terms of gameplay, these Chemists provide fellow Legion characters with bonuses to healing and status removal. At the same time, their abilities have a negative effect on opposing characters. These characters shine against Disruptive status dealers.
(Description quoted from the Karmethian Chemist card Etsy page)