DISCLAIMER: Your Steps and Tasks may be different
You can do this quest in several zones and it is an easy low level weapon upgrade. There is more than one NPC who gives it. Cherts drop from multiple low level mobs. Bring one back and he will make you a weapon:
Thin Chert = flint dirk
Flat Chert = flint knife
Round chert = flinthead club
Stonemason Harwin says, "Greetings, I'm the master of stonemason hereabouts. You look in need of a decent [weapon]. Perhaps I can help you in that regard, though it may put you in a bit of danger."
Stonemason Harwin says, "Aye, though you may scoff at the idea, stone weapons, if made correctly can be quite effective. I can make a [knife], a [club], or a [dirk] depending on the shape of the [chert] I start with."
Stonemason Harwin says, "Ahh, a slasher are ye? Well, in order to make a knife I'll first need a flat [chert]. If you bring me one I should be able to make a knife for ye."
Stonemason Harwin says, "A crushing weapon?" Squeamish at the site of a little blood, eh? I suppose I can make you a club if you bring me a round [chert]."
Stonemason Harwin says, "Ok, I should be able to manage a dirk for you. I'll need a thin [chert] though to get the best thrusting action. If you bring me one I'll make you a dirk."
You receive a flinthead club from Stonemason Glover!
This quest does NOT show in your journal and is repeatable.