My kayn builds

Darkin has some fun builds centered around sustain, here is the one i use And 18 in defense with grasp and defensive runes

really annoying to deal with

lots of sustain from attacks and spells and KV

if you ever get low jump into enemy with high hp for the nuke then while you heal to 100% again stoned plate is used for the same thing essentially In between that you can enter walls to evade combat and again let kv + regen heal you up

real annoying haha, your pretty tanky with alot of combat sustain and if they get you low you just give em the middle finger by avoiding death over and over and over

Have not yet played assassin but since his damage gets enhanced

id go with full lethality page + defense + TLD keystone

gives a little surviveability and letting the double enhanced triforce procs do the work alongside enhanced TLD and Duskblade and Tiamat procs There is probably a better assassin build out there but this is what i would likely use