Serpent Dart

Weapon (dart), uncommon

You can use an action to cause thick, emerald green poison to coat this magic dart. The poison remains for 1 minute or until an attack using this weapon hits a creature. That creature must succeed on a DC 14 Constitution saving throw or take an extra 2d8 poison damage from the attack and become poisoned for 1 minute. Once this property has been used, it can’t be used again until the next dawn. 

Simone's dress was the focus of everyone of the gala - that was, at least, until she let her hair down. Her bouncy curls offered the perfect distraction for her to summon poison from a small, snake-like dart, which had been holding her hair in a bun until a moment ago.

No one noticed the guard fall down and clutch at his now paling throat: they were too busy talking to Simone.