Ahma

You cast a spell called Ahma (it means "Black Rain" in English) that makes black rain and makes the enemies eye sight drop by alot (can barely see) roll a 1d20 if it beats their armor class it blinds them if it gets lower than their armor class then it doesn't work.
Roll a 1d20 for every enemy. The DM will tell you what happens. (lasts for 2 rounds)