Cronan is House Lattimore’s butler.
A former adventurer with a dark past. He is a master poison-maker, growing the deadly plants and creating vials of liquid death. He is now the effective leader of House Cronan.
The true source of House Lattimore’s power was in their illicit poisons. Olan still is not aware of how his house was able to survive economically, as his brother never shared the nature of Cronan’s craft.
Cronan continues to sell his wares, but now pockets the money for his own purposes.
The poison used by the PC’s to help Olan overthrow his brother was provided by Cronan, to facilitate his financial independence. He isn’t sure what he wants to do next.