Oil of Concussion
Oil of Concussion is a magic item (potion) of common rarity.
Summon this item
Describe it your way — Oil of Concussion is already filled in.
You can apply this thick, gray oil to one bludgeoning weapon or up to 5 pieces of bludgeoning ammunition. Applying the oil takes 1 minute. For 1 hour, any attack with the coated item scores a critical hit on a roll of 19 or 20.
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Further reading
Jetpack7 Game Master SeriesThe Game Master's Book of Random Encounters
Jeff Ashworth · 2020
The Game Master's Book of Traps, Puzzles and Dungeons
Jeff Ashworth · 2022