Dirty fighting

You learned to fight dirty from your father who taught you to win no matter what you can use sand, crushed glass pebbles or rocks. Sand will cause blindness for a action of there glass will cause blindness till all the glass is removed it takes 2 to 1 actions of all of the glass out of there eye only 4 can be in a eye pebbles cause them to be stunned for a bit only if hit in eye now rocks that are big cause them to be stunned and it does 1d6 damage it does take a strength check to throw it