There has been a surprise change to crafting in Diablo 4: Vessel of Hatred and Season 6 — Obducite has become the only Masterworking material in the game! Read about the most important changes to Tempering and Masterworking published in the 2.01/2.02 Patch Notes and other communications Blizzard has made in Patch 2.01/2.02.
2.01/2.02 Patch Notes Season 6 Livestream
The big news in Diablo 4 Masterworking is the elimination of Ingolith and Neathiron! Now, all of your Masterworking will be done with Obducite. There will still be up to 12 ranks of crafting — you just won't have to convert materials anymore!
Farming Obducite has changed, too, and will be less of a grind. The primary place to get Obducite as of Season 6 is Nightmare Dungeons, and it drops practically everywhere in them! Blizzard gave the following list of places within Nightmare Dungeons where Obducite can be found:
It should be noted that Nightmare dungeons will no longer drop Glyphs. Players can find those in The Pit going forward.
Some additional changes coming to Masterworking include: