If you have riven, goes in place of [Organ Shatter]. This build works with all nikanas. For any other [Nikana], replace [Sacrificial Steel] with either [True Steel] or [Buzz Kill] for the extra slash procs. If you aren't a fan of berserker or are simply too low level to obtain it, [Reach] or [Fury] works fine. If you want, you can replace [Vicious Frost] and [Virulent Scourge] with anything else that still procs viral, just keep the same capacity. That way, the slash procs are able to build, because too much viral is trash. However, the current setup works the best on the skajati.