Go to the Hidden Refuge in Tenebrous Tangle and speak to an old man behind the waterfall, at ( 82, -213, 194 ) Copy/waypoint 82, -213, 194. He will give you a level 50 artisan recipe for Re-shafted Wurmslayer.
Be very friendly and cooperative in your conversation. If you say the wrong thing the old man will grow tired of the conversation and you will have to start the dialogue over.
Retrieve the oak shaft from a chest in The Lair of Scale within the Sanctum of the Scaleborn, at ( 23, 121, 307 ) Copy/waypoint 23, 121, 307 or ( -3, 122, 334 ) Copy/waypoint -3, 122, 334.
If you use these waypoints from the entrance, it will lead you to a locked door. You'll first need to go to the Hall of Rites ( 8, 65, 14 ) Copy/waypoint 8, 65, 14, take the south hallway to The Gorgs' Pit ( 11, 57, 310 ) Copy/waypoint 10.91, 57.13, 309.99, and then climb up to the Audience Chamber. From here the wisp will direct you to the chest.
In the Sanctum of the Scaleborn, go to the unique forge at ( -116, 65, -34 ) Copy/waypoint -116, 65, -34 and craft Re-shafted Wurmslayer.
While you must be a level 50 artisan to scribe the recipe, it is a level 60 Geocraft combine. If you are lucky or skilled at crafting you can do this with lower than 300 Geocraft.
You must create a pristine item or you will fail and your resources will be lost.
Return to the old man in Tenebrous Tangle. He will give you a level 55 artisan recipe for Re-bladed Wurmslayer.