Homebrew
AMMUNITION RARE TECH
A special shell filled with gas pellets that shatter and spread out in a cone. It is sold per shell.
Paralytic gas. When it's fired it spreads a gas in front of the scattershot. In a 15 ft Cone centered on the user, all creatures must make a Constitution Saving Throw DC15 (or uses the DC from the crafter), on failure the creature gets the Paralyzed Condition for 3 rounds. The creature retakes the Saving Throw at the end of their turn.