Deadly Derivation
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Deadly Derivation is a passive feature that heals the wearer a little when they poison a foe.
Description
When you 
Poison a foe, heal yourself for 1d4
hit points.
How to learn
Granted by the equipment:
Notes
- Surprisingly,
Poisoned applied by a weapon coated with 
Basic Poison does not trigger Deadly Derivation. If, instead, the potion of Basic Poison is thrown, it causes a 
Poison Cloud that can trigger Deadly Derivation. The throw also causes a blast that can apply poison, but this version of Poisoned condition is similar to the one applied by a coated weapon and does not trigger this passive. Both Poisoned conditions use same icon, but the one from Poison Cloud shows the duration number (1) and timer (brown arc around the icon), while the other does not. - It is triggered by applying poison through
Envenom on the 
Poisoner's Gloves. Because of this, it also works well with Venomous Revenge on 
Broodmother's Revenge, especially when used in conjunction with 
Bestow Curse: Constitution Disadvantage by those with high attack ratings and/or multiple attacks per round.