Grenade, Flash (Major)

Grenades can be set to detonate on impact or with a timer that causes them to explode on initiative count 20 (losing all initiative ties). As an action, you can prime and throw a grenade at a point you can see within 30 feet + your Strength modifier x 5. Each creature within 10 feet must make a DC 18 Constitution saving throw. On a failed save, a creature is blinded for 1 minute. At the start of an affected creature's turn, it can repeat this save, ending the effect on a success.