Imported from the Shadowfell, this thorny bramble yielded 10 thorns. Each thorn can only be used once, and have the following properties:

• Can be set as part of a trap with a successful DC 10 Sleight of Hand (DEX) check, or blown out of a blowgun. If successfully hitting a target, you deal 4d6 Poison damage, or half as much on a CON save of the players spell save DC. 

OR, the item can:

• Can be set as part of a trap with a successful DC 10 Sleight of Hand (DEX) check, or blown out of a blowgun. If successfully hitting a target, roll 10d12, and you are capable of putting the rolled number's worth of HP to sleep.