OP Nasus guide
I hate and love this champion. I love him whenever I play him but hate him whenever the enemy team has him, especially if I'm laning against. I already reached gold and with runes being changed I don't mind sharing this. since the state of the champion may change significantly next season. If you already know how to play Nasus well and are confident on your skill with him then just skip on down to the build and climb.
A bunch of reasons have lead to Nasus to this state. His itemization has been buffed, he has been buffed, and his weak match ups don't exist anymore for various reasons. Except for Fiora [ BAN THIS CHAMPION]
combined with his passive have created it a state where Nasus can just not give a shit and shrug off the poke long enough to get enough farm for a decent first buy. Add that a lot of his weak match ups require they play aggressive, like staring your tower in the face aggressive to deny you a decent amount farm that even if they ward they will be so far up that they wont a be able to escape a jungler with just a little bit of CC and red buff. But even if you don't get jungle pressure you at worst get a slightly less decent first buy. Stacking is important, but the most important thing to do in the early game as Nasus like any laner is too make sure your farmed will. If you do get into a tough match up, don't be afraid to farm with E.
For AD match ups
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For AP match ups just build
first and get
instead. Just build
when you think it is necessary. Just make sure you finish it before 
lets you close the distance between anyone that can fight you outside your wither range and the rest is just tank stuff that works the best at this time.
is way too expensive right now and not worth it, I NEVER BUILD IT.
is not really making the item better than IBG in the long run.