Oil of Diminution is an uncommon type of Coating that can be briefly coat a weapon.
Gazing through the glass bottle, everything seems shrunken and contracted - almost gaunt.
Properties
Single Use
Rarity: Uncommon
Weight: 0.1 kg / 0.2 lb
Price: 30 gp 
UID
ALCH_Solution_Oil_Reduce
Effect
- Coat your active weapon with oil for
Duration: 10 turns
- Weapon receives a -1 penalty to damage and Attack Rolls
- Inflicts
- Duration: 2 turns
Constitution saving throw: DC 11 to negate.