Envenom is an attack skill. It is used to add extra poison damage to a weapon. If successful normal attacks will have an additional special for a limited number of hits.
It requires some poison to coat a blade or pointed weapon.
(works best with pointed weapons, as they deposit closer to major organs)
It uses 50 gp.
I see the special damage being based on poison quality; number of hits should be based on st.at.it.poison and st.at.it.weapons.

Thoughts?