Hardened Delerium-Tipped Blowgun Needle

This piece of ammunition has a refined delerium arrowtip. A creature hit by a ranged attack using one of these arrows takes an extra (3d6) necrotic damage and must succeed on a DC 15 Constitution saving throw or gain one level of contamination. Once it hits a target, the delerium tip crumbles to dust and the arrow becomes nonmagical.

Ammunition: You can use a weapon that has the ammunition property to make a ranged attack only if you have ammunition to fire from the weapon. Each time you attack with the weapon, you expend one piece of ammunition. The ammunition of a firearm is destroyed upon use. Drawing the ammunition from a quiver, case, or other container is part of the attack (you need a free hand to load a one-handed weapon). At the end of the battle, you can recover half your expended ammunition by taking a minute to search the battlefield.