The Venenum Temple trains and deploys its assassins on behalf of the Officio Assassinorum upon receiving orders by the High Lords of Terra. The temple is presumably located, like most other assassin temples, in a secret location on Terra.
Their operatives are experts at using poison and subtlety. One of the most notable operations of the Venenum Temple was the elimination of a heretic ruling house through the use of poison on their seats. This operation was conducted by the assassin Urhua Thereaux.