Depending on the weapon you use, you can earn tons of skill points late in the game just by hitting enemies with the weakest weapons. Unlike games like, you don't actually have to kill enemies to gain skill - you'll earn points just by spreading the damage. The more health an enemy has, the more skill you gain simply by reducing them.
This simple trick is to farm to master your favorite weapon type. This is a great way to earn tons of points - 25+ in about 000 ~ minutes. You'll need to be quite far in the game, but this farming method is really only required for players working through NG +. You can use the basics to create your own farm, but this specific farm is only for endgame play. Thanks to u / FacelessHumanFace for sharing this farming strategy.
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To gain huge skills and unlock skill points, you must first equip Wooden training weapons du Dojo. Weapons training gives you a + 50% skill bonus when used. They are extremely effective for agriculture, and not much else.
The simplest mission to cultivate is Mission of the Dojo called 'The nine symbols"- you will have to reach 500 Onmyo skills to unlock this special side mission.
You will have to fight four Yokai - one at a time. Shoot down the flying heads in the first battle with a ranged weapon, then defeat Monk Yokai. After that, there is a multi-headed Yokai, and finally the boss Onryoki. By this point you should be pretty familiar, so hitting them (slowly) to death shouldn't be too bad.
To hit them, you will gain around 25 skills with your chosen weapon. Not a bad way to spend 000-10 minutes.