This is a player-created Build for Nioh.
I run strictly damage skills with a bit of healing just in case, I'll go into each skill tree pointing out the ones I got. I'm only writing the ones that matter but remember you will have to unlock some to get to the ones written down, but the magic stay at 15 should give you enough for everything.
Onmyo skills: Panacea curefast lll Awakening
Ninja: Enlightenment Sneak attack Dashing lll Cloud runner lll Dodging lll Quick-change l (this is an amazing ability for bosses) Medicine power pill 1 Snakebite technique lll (this is for weapons that're buffed with poison/fire etc, it really boost the effects of the DOTS)
Passives: You can have passives from weapon trees even if you don't use the weapon, for example cornered boar on the axe tree is great.
Axe- Cornered boar level 3 Kusarigama - shadow strike level 3 Third rule of thrusting level 3
Sword skills: Mystical art: sword of execution Grapple Flux ll / flash attack Iai Draw lll (learn to combo with this, it does insane damage) Sword ki / relentless lll Swallow's wing (goes well with iai draw because it puts you far enough to land it safely) Ki pulse; heaven, man, earth Living water; heaven, man, earth Heaven step/swift strike.
I switch between mid/low stance a lot while combing, the best and easiest combo to land some insane damage is too press square 4 times then triangle (with light armor it'll do a back flip and send you back) then quickly press R1+O to do the iai draw, let it charge and release on its own, then dodge if needed or go for the finished. Using iai draw is good if you learn to use it every time with no issue, I had trouble doing it while fighting but it takes practice. If you get them out of ki, while they're recovering, quickly hit them with the iai draw and then do the ground finisher and as they stand up, iai draw again.