One thing that I noticed, why is there 3 fountain of renewals on koshka? If anything, max of one and put a broken myth in that. Also, most people in late game end up selling their frost urn because it's useless. No offense but I don't think a lot of koshka players would go with the koshka build...... Have a look at the build that I made, and look at the build description. Idk, it just seems like you are more of a support than an assassin..... Koshka is meant for damage than support health,...

It's true, with just an aftershock, crucible, aegis, and journey boots, it works really well. I don't lie when I'm building stuff, I would HIGHLY recommend you take this build

Umm, how long have you been playing? Skaarf should be really low because he is so easy to get, also, have you ever played saw? Sorrow blade is extremely helpful, crystal is okay but sorrow blade and heavy steel are top priority because they do so much damage