In the various forest of the realm, there can be found an arachnid that is commonly called a Fiddleback. Such spiders are usually found in large numbers, preferring areas with thick vegetation, rotting wood, and heavy rainfall. These spiders average one foot long and can jump approximately ten feet from a prone position. 
 
Once they trap prey, they will swarm it and feed on it, till there is nothing left. During these times, their numbers can grow to such proportions, that they must be culled, before overrunning their environment.
 
It is also a time when we can harvest their glands, and process that into a superior form of poison that can be used for any number of studies. And this arrangement allows me to bring this substance to those seeking to study it. Corked and sealed in a vial, to preserve its potency. Sufficient for all magical potions, magical studies, and spell components.