Traveling down the path from Hawkesburn, past the Rockslide battle, the tutorial will end, after talking to two men at their wagon at the crossroads. The men tell of a beast, found in the graveyard near Wetterton, that attacked the man that they have in their cart.
Head west from the wagon, and follow the road to its end, where you will come across this graveyard. Approach the Grave hag in the centre and start the A Mourner from Wetterton battle. After the death of the Grave Hag, the quest concludes.