Reassemble and Use the Vermillion Lens

Journal
''I fought my way to the chamber beneath Grannus' colossal statue, only to find that the Vermillion Lens has been broken! I found a piece of it, along with a letter which implied where the other two pieces could be found, the Epitaph in Desolis and the Oracle Colossus near the Black Blade Pass.''

''Once I find the pieces, I should take the pieces of the lens to the Obsidian forge within the fortress of Hilt. Luckily I found blueprints for assembling the lens along with the first piece.''

After the pieces are combined into one lens, I will be able to use it alongside the other two lenses in the Confluence Chamber.
 * You will need to find all three Shard of a Vermillion Lens first, then enter Nightshade Pass and go to the entrance to Hilt. 2 Doors will will allow you to enter Hilt, but to be able to use the Obsidian Forge and reassemble the lens, you must specifically enter the door that is labeled: Enter Hilt Fortress [This door can only be used for "Reassemble the Vermillion Lens" quest.