In case anyone is curious, a near sure fire way to beat Nasus is with Stormraiders and building Cleaver and Sheen (into Iceborn Gauntlet later). You get your graves, land Mourning Mist when Susan goes to stack, pop walkers, run at him W him wait till he autos the wall once then finish closing and Q him, you just procced Stormraiders and can ignore his Wither if he turns on you, or get in front of him and let the walkers rip him up since he's wasted 2 autos probably empowered Q autos on minion and wall. You'll likely kill him early doing this around level 3 or 4, after 6 you do the same thing but drop the Maiden on him, Q him walk around as you wait out his Wither and close enough that he'll chase you while his Ult is running, then once the Wither wears off auto him and Q him again and he's dead.
Rinse and repeat until the jungler starts camping you, because you will draw attention using this kind of approach.