The Wisp-Touched Elderhide that you receive from completing this quest is the required crafting item in the Legendary armor recipe.
The quest series ends quite abruptly with no explanation of where to go from this point forward for the first timers working on this. The pattern itself is taught by trainer in Dalaran.
While i cant confirm this, its possible the pattern does not become available until after you complete the quest line to get the Wisp-Touched Elderhide. Im fairly certain i had checked the trainer before starting the quest line and the pattern wasnt available. After completing the quest line, the patterns appeared.
Quest
Wisp-Touched Elderhide
Quest facts and objectives from the current retail game data.
Quest facts
The client quest POI data records no map location for this quest, so no map is shown.
Check whether you have already completed this quest
in-game: /run print(C_QuestLog.IsQuestFlaggedCompleted(46689))
Description
Dreadleather, with knowledge carefully reverse-engineered from ancient texts, can be worked into elderhide. It is partly a matter of advanced craftsmanship and partly a simple magic of the earth. With the ancient wisps you caught and the materials you've captured and the research I have done, I have put together a Legendary Tanner's Kit for you. Take it to the heirloom hides of Hrul Sharptooth in Thunder Totem. The wisp will help you use the kit there to create Elderhide.
Community notes from Wowhead · 1 comment
The comments below were written by Wowhead users. They are community notes, not TheWoWDB comments. See them in context on Wowhead.
Reward details
Items you receive
“Can be used to craft legendary leather armor.”
Item facts are the current retail client’s (ItemSparse); the specialisations for a pick-one item are the ones the Blizzard quest API lists; faction and currency text is the client’s own. Lowest listed price = the US commodity auction house now.