Huecambra Gems

These gems can be thrown 20ft + 5ft*StrMod, exploding in a 5ft radius.
From the centre of the explosion each creature must make a DC 14 Dexterity saving throw. On a failure, a creature takes 3d6 thunder damage and is stunned until the end of its next turn. On a success, a creature takes half the damage and isn’t stunned.