The Obsidian Lathe in Mortal Shell 2 is a special item used to upgrade weapons and equipment. To obtain the Obsidian Lathe, head to Widow's Cliff and enter a special building to find a unique area known as the Martyr's Tomb. Open the door and loot the chest inside to acquire the Obsidian Lathe.
How to Obtain the Obsidian Lathe in Mortal Shell 2