I am still learning the rules and preparing for the first session, but from the initial reading
- Poisoner is to grant access to poisons to non-rogue professions and allows to craft poisons. It does not require spend of Will Power, which is finite resource per session.
- Poisoner provides Artifact Die
- Activating the features from the Path of the Poison costs Will Power points, those are finite.
The two talents do not exclude but compliment each other.