If you level Blacksmithing after completing the achievement, the quest might be missing for you.
So far, i wasn't been able to find a workaround.
Achievement (the one to free the runecarver) was earned on 24/11/2020, and Blacksmithing leveled to 100 on 27/11/2020.
Quest
The Vessels of Metal
A World of Warcraft quest in The Maw. Facts and objectives from the current retail game data.
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Same for me. I opened a ticket and am waiting for a response.
..
Well the response to my ticket was that they were too busy to look into it. I finally looked deeper into my BS recepies and found that they were there. Don't know how it happened but you might want to check down the list of receipes.
I was in the same position as you. I walked back to the Runecarver and he gave me the quest.
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(62797))
Description
You have the bearing of one familiar with the art of smithing. But perhaps you have more to learn. Vessels that hold the power of the runes can be crafted by a hand such as yours. But this I cannot teach you. Hmm, there is a way. I will entrust you with a memory of my recipes for the vessels. Take it to a master of your craft and they will show you the way. What's that? Do not worry. It is merely an echo of my memory. What you restored to me remains intact.
Community notes from Wowhead · 10 comments
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Spell: Shadowghast Armor RecipesUnlock the Shadowghast Armor recipes at your trainer in Oribos.