Having an issue with a certain boss in Nioh? Is it driving you to the point that you just want to rage quit and stop playing? Not a problem, there is a very simple trick, which will allow you to defeat any boss in Nioh.
In order to manipulate this secret, all you need to do is use the Soulstones to power up your living weapon (it should be worth noting that the easiest way to do this is to place your Soulstones in a quick select item slot). Once you give a buff to your weapon, then spam the living weapon with the button combination Triangle+Circle.
Once your living weapon is empty, use another Soulstone, and repeat the process. Make sure you back up your saved game data (via PS4 Settings > Application Saved Data Managment) before your next fight so you can get your Soulstones back, just in case you are still having a hard time finding the right process with your boss battle.
As long as you have a consistent amount of Soulstones in your inventory, nothing stands in your way in tackling every boss in the game. You can receive more Soulstones regularly as an incentive for completing a mission, or you can find additional ones in the form of loot.