The Trait of venoms of the Thief (Leeching Venoms) should be changed to another tree.
For example, in Mortal Arts is more related, like in topics and other traits, or in the Acrobatics tree there is no skill trait.
In Art of the Shadows it has little to do, it does not combine with more fulminating features and stealth traits, worst it means sacrificing Stealth skills for Poison skills, gained little or no benefit.
When are you going to make this change ?? It is long asked!