Alchemical Thunderstone CC:A

This dull yellow stone has a porous quality, and emits a bright light and loud bang when shattered. As an action, you can throw the stone up to 30 feet, shattering it. Make a ranged attack against a target with the stone, treating it as an improvised weapon. On a hit, the target takes 1d4 thunder damage and must make a DC 13 Constitution saving through. Each creature within 15 feet of the target takes 1 thunder damage and must also make the same saving throw. On a failed save, each affected creature is blinded and deafened for 4 rounds. On a successful save, the creature isn't blinded or deafened. An affected creature may attempt a new saving throw at the end of each of it's turns, ending the effect on itself with a success. 

Creation

• Material Cost: 25 gp per attempt
• Crafting Time: 4 hours (two stones per attempt)
• Craft DC: 10

This item is intended for use with the Crafting Competence series: Alchemist feat. It is a bronze level recipe, and so available for research from levels 1-4.