Serpentine Spellslinger

Spell Skills have +12% to Damage over Time Multiplier for Poison
Enemies Poisoned by you have -5% to Chaos Resistance [1]

Serpentine Spellslinger is a notable passive skill that grants spell skills additional damage over time multiplier for Poison. It also reduces the enemy chaos resistance if they are poisoned by you.

Anointment

Blight anointment to unlock the passive:

Oil #1	Oil #2	Oil #3	Outcome
Indigo Oil	Violet Oil	Opalescent Oil	Serpentine Spellslinger	Spell Skills have +12% to Damage over Time Multiplier for Poison Enemies Poisoned by you have -5% to Chaos Resistance

Version	Changes
3.16.0	Make clusters more unique compared to each other as well as having a more clear identity. Remove niche or unneeded stats entirely, or shift them to Masteries. Improve many notables that have had secondary stats removed. [Undocumented This change was not documented by any official sources. It was discovered through player testing or datamining.] Now grants Spell Skills have +12% to Damage over Time Multiplier for Poison (up from 8%). No longer grants 15% chance to Poison on Hit with Spell Damage.
3.11.0	Introduced to the game.