explain to me how is this balanced in any way

I'm riven playing against a nasus, get first blood on him and he plays safe. Let him push a little and my WW jungle comes and we killed him, he rushes ninja tabi and proceeds to use his ghost summoner withers me and ults to dive me under tower and kill me but he also dies. After that he just becomes unkillable and out damages me every time while he heals any little damage I do back at him all while building full armor. By the time I have black cleaver he just stronger and better then me in every way.
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