The two poisons of Messengers Bleak are known to only be made by the Elon folk, and are whispered in legends of the poisons and toxins in the realms. It is not given or sold to anyone outside the Elon community.
One is absorbed through skin and makes the target mentally weak.
The other is a brutal toxin grown by special plants which only have an antidote in the Fhayl Forest. It is what they are most feared for and why despised by many, ultimately left mostly alone. It has an onset of 1 round, each round thereafter they gain a cumulative measure of Exhaustion until dead.