Oil of Diminuition saps enemies of their strength and weakens their meelee attacks.
Gazing through the glass bottle, everything seems shrunken and contracted - almost gaunt.
Properties
Potions
Single Use
Rarity: Uncommon
Weight: 0.1 kg / 0.2 lb
Price: 30 gp
Effect
Bonus action
Coat your weapon in oil:
- The weapon receives a -1 penalty to damage
- Targets must succeed a Constitution Saving Throw
- On fail, enemies have
Disadvantage on 
Saving Throws and Ability Checks. They also receive a 1d4 penalty to meelee damage.