Ghast Oil
“A ghast’s stench is amongst the most vile and pungent smells an adventurer can encounter. But for crafty alchemists who can stomach the stink, a ghast’s remains can be processed into a potent weapon. This bottle contains a finger bone of the aforementioned undead, and oil derived from what little flesh the appendaged had left.”
All creatures within 5 feet of the bottle when it is opened must succeed on a DC 10 Constitution saving throw or be poisoned for 1 round.
The ghast oil can coat one slashing or piercing weapon or up to 5 pieces of slashing or piercing ammunition. A creature hit by the oiled weapon or ammunition must make a DC 10 Constitution saving throw or be paralyzed for 1 minute. At the end of each of the target’s turns, it can repeat the saving throw, ending the effect on itself on a success. Once applied, the oil retains potency for 1 minute before drying.