If you mean the illo at the bottom left of page 10, that's a blowpipe.
The wayfarer in the background isn't going to know what hit him.
The story? Which recipe the kobold uses, when preparing said wayfarer…#Realmslore— Ed Greenwood (@TheEdVerse) April 9, 2020
Your typical blowpipe is a hollow swamp reed (it takes a LOT more work to find a straight branch and hollow it out). Over time, reeds dry out and split at the ends, deflecting your dart. To prevent this, a whittled wooden 'sleeve' is affixed over the end with pitch.#Realmslore
— Ed Greenwood (@TheEdVerse) April 9, 2020