Ash-blast jar

Contained in a jar is a strange dust substance that, when released, will fill up the air with dust. This jar can be thrown (60ft) blinding anyone in an area that varies based on rarity that does not succeed a dexterity saving throw, the DC of which varies based on challenge.

Common 10ft cube, DC 12
Uncommon 15ft cube, DC 14
Rare 20ft cube, DC 16
Very rare 25ft cube, DC 18