Create Sand Or Destroy Sand

you either create or destroy sand

create sand:You create up to 30 lb sand. you shoot the sand from your hand actually.Also you can extinguish flames if you use it rigth.If you create sand and you aim somewhere you need take a 1d20(accuracy).If you hit somebody with it the target needs to take a dexterity saving throw or he gets a knockback depends on the throw

7 or below =5 feet knockback

8-9= 4 feet knockback

10-11=3 feet knockback

12-13=2  feet knockback

14-15= 1 feet knockback

16 or higher = no knockback

the dm can change it if he really wants to.

destroy sand:you destroy up to 30 lb sand.You need to see the sand what you want to destroy