As you accumulate hours in Sekiro: Shadows Die Twice, you will want to improve the prosthesis of your shinobi arm to the maximum. But unfortunately, the materials you need for that are progressively rarer too. In this guide, we’re going to tell you how to get special materials, including the most infamous of all: lapis lazuli and mercury fulminate.
We’ll start giving you bad news, and if you want to improve all the weapons you will have to complete the game twice because in a game there is not enough material to be able to improve everything. It happens the same as with the titanite slab of Dark Souls, if you know what we mean.
Yes, it is practically the end of the game, but you can also get mercury fulminate a little before that. Your alternative is to go to the fortress in the submerged Valley and the Ashina Depths to eliminate enemies equipped with firearms until they end up releasing this material.