Ajida

Odorless and colorless liquid, this delayed poison can blind definitively.
A creature that ingests this poison must succeed on a DC 18 Constitution saving throw or feel dizzy (with little consequences) for 1d8 minutes. After this time, and in case of failure on the first roll, it must succeed on a new DC 14 Constitution saving throw or become blinded. Only magic can restore a creature blinded that way.