Poison Mist is a weapon action granted by 
Argument Solver.
Description
On a hit, deal extra 
Poison damage equal to your proficiency bonus and surround the target in a noxious cloud that possibly 
those within it.
Properties
- Cost
Action- Damage
- Normal weapon damage
- +
- Details
Attack roll
Range: Normal weapon range
Creates Area: Poison Cloud
Recharge: Short rest
Area: Poison Cloud
Poison Cloud 
Duration: 3 turns
AoE: 1.5 m / 5 ft (Radius)
Chance to set Poisoned.
Type: Cloud
Condition: Poisoned
How to learn
Granted by the weapons:
Notes
- Targets inside the Poison Cloud created by Poison Mist roll their saving throws against your spellcasting DC rather than your weapon action DC.