https://www.youtube.com/watch?v=aQ2-PICH0Ls
Basically you have to get this pig (that you would normally kill) to follow you through most of a zone to reach this grass patch (that looks like every other grass patch) so he can start chewing at it and uncover the mighty Pickaxe. One of the most garbage weapons in Darks Souls 2. No way anyone could have figured this out on their own.

