[Autumn]

In my opinion the Sayakensa should add 50% Dark ATK as a secondary damage instance to Kensei skills, its not like before GR where hexer could be used to boost the damage by 10%, unfortunately Sayakensa in its current state is just a relic of the past.

running dark damage on your katana hits makes you assuredly lose damage, as everyone has elemental resistance from base aptitude SAN, at least in this way you still run the risk of hitting a resist proc but also you don't actually lose a huge chunk of your damage as a result.

I also think removing the -2 vitality is a solid option, negative stats don't do us a whole lot these days.