Blinding Ink

You command ink into the eyes of a creature. Choose one creature that you can see within range to make a Dexterity saving throw. If it fails, the target is blinded for the duration. At the end of each of its turns, the target can make a Constitution saving throw. On a success, the spell ends.

At Higher Levels: If you cast the spell using a spell slot of 2nd level or higher, the duration increases by one round for each slot level above 1st.