skulls

I know JR knows about these, but has anybody actually tried to get any of them. If u have no idea what i am talking about, Bungie but artifacts on maps to make the game harder or easier depending on what u go after. There are skulls that take away your crosshairs and make it a real first person shotter, then another that makes grunts blow up like plasma granades, etc. If u want to see what one looks like, then on the second board, jump on the door ledge then jump again ontop of the roof, then run down the alley and ull see a pair of granades with a skull. Pick it up and then drop it. Instant first person. Oh yea, forgot to mention, u have to be on legendary on them.