Fléchette

2d6 Fire, Thrown (20/60), Quick (bonus action)

• {e} Spellcaster: Create a green, lightly obscured, cloud in a 10 foot cube within 5 feet of you, lasting 1 minute.

Any creature moving into the cloud for the first time, or starting its turn there must make a DC 13 Constitution saving throw, taking 2d4 acid damage
on a fail, and half as much on a success.