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Brew Poison and Craft Poison are codependent - one can't function without the other. That's why Craft Poison only appears on the Assassin's and Black Guard's skill lists.
In order for a character to use Brew Poison they must have:
- The appropriate craft component(s).
- 1 or more ranks in Craft Poison.
While this may not seem an accurate representation to some people, it does follow the gist of the 3.0 rules in that poison use is restricted and it requires a skill check to create.