So I just wondered my way to huntsman's copse and there is this guy who just talks about his obsession to darkness but say if 'you have the gift' he'll do something, what exactly so I give the guy?
That's Felkin the Outcast. He likes Hexes.
If you have 8 INT and 8 FTH, he'll let you purchase some hexes and useful items.
(A note on the Fextralife wiki also seems to indicate that you may also need to kill all of the bosses in the Huntsman's Copse before he'll give you the armor and staff, but I can't verify that.)