If you're looking to get around a few lazulite in one playthrough, or you're just too lazy to get all 6 in one a simple way to get them is
-Kill Shichimen warrior in Fountainhead Palace.
-Kill/cheese The Demon of Hatred at the end of the game during the invasion of ashina. (this gives 2 lazulite ore's.)
-Kill the Great Carp using the Bait given by pot guy merchant, go back to him after killing the Carp and there will be a free lazulite next to his pot after he becomes a Carp.
-Farm the carp in the Hirata estate next to noble boy, You should have enough to buy another lazulite for 6 carp scales. (He sells two each for 6 scales.)




Pretty helpful right?

A really simple way to get these items is
-Killing the nobles in Fountainhead Palace.
-Killing the monks in Senpou Temple.



Pretty easy to get these items if you have Demon Bell.

Easiest way to get Fulminated Mercury is by.
-Using golden vortex on the Red Gaurds at the Ashina Castle Idol at the end of the game when they invade Ashina.



Reminder to have Demon Bell enabled to increase the drop rate.

-Okay an easy way to obtain this is
-Use Gachiin's Sugar, Demon Bell, and BloodSmoke Jutsu.
-Backstab the Spear Monk using Gachiin's Sugar at the Senpou Temple Main Hall Idol, and use Bloodsmoke Jutsu to backstab the other one.



Rinse and repeat till you get how much you want.