Cultivating Decay

These folks never paid me no mind before, so I figured I'd grab one more sack of grain and make my way south. That's when I saw him, a strange lookin' fella all swathed in black. He had these farmers load all the grain onto a cart and he made off towards the quarry. Strange thing is that quarry failed long before my farm did, stone trolls you understand. I don't know what he's doin' with it there but the whole thing reeks o' taint if you ask me. You don't have to worry about me not one bit, you got my oath, no more stealing. I'm getting out of here as fast as I can.

Travel to Stormblight Hills and enter the quarry there. Fight your way through the tainted creatures in habiting the quarry. Then locate the cart of tainted grain left there by the man in black.