This opaque green, viscous oil produces a fine green mist when shaken and  singes the hair of any being who sniffs it. The oil can coat one slashing or piercing weapon or up to 5 pieces of slashing or piercing ammunition and takes 1 minute to apply. For 1 hour, the coated weapon is considered magical for the purposes of overcoming damage resistance and any successful attacks with a coated weapon or ammunition adds acid damage based on the potency of the oil (see below).

If a non-magical weapon is coated with this oil and is not cleaned and sharpened within 1 hour of its effect wearing off the weapon begins to corrode and will require a blacksmith to repair.

Potency (higher potency is a deeper green color) :

• Minor (uncommon) : +1 damage
• Lesser (uncommon) : +3 damage
• Intermediate (rare) : +5 damage
• Greater (rare) : +7 damage
• Major (very rare) : +9 damage