Ok so this is my first build on this site so dont judge me too hard. This is just a build I like a lot and fits my playstyle.

Personally I like the standard AD offense build for Nasus due to him getting a lot more kills with it. But a good defense build will work with my set too.

Again this build is about being unkillable with your q wrecking face after being farmed to over +500.

Ok so from the items I have this is a sort of tanky build. Nasus plays best in my opinion as a tanky dps/harasser.

Ok, first off I usually go for my boots first. I like the cooldown reduction boots best, because nothing hurts more than 15% more <siphoning strike>s. However the armor/dodge boots are good if you going against a melee heavy team or you don't have a real tank on your team.

Next, I always go for my <Manamune>. It gives a **** load on mana which I use to constantly harass with <Spirit Fire>. Now I realize that last statement may turn off a lot of veteran players after what I have seen in a lot of other Nasus guides, but hold on and I will explain more in the skill section.

<Frozen Mallet> is just amazing for Nasus since he is very vulnerable to being kited. I know he has Wither but this not only gives us this passively but extra health and AD too.

http://edge1.mobafire.com/images/item/shurelyas-reverie.gif gives more sustainability and more cooldown reduction which equals more Siphoning Strikes.

<Sunfire Cape> is just awesome when combined with your ult. If they still stand next to with both of these ticking on them and you beating on them, they are either afk or ******ed.
<Atma's Impaler> is awesome for every tank in the game. You can pick this up earlier if you want but if you get to buy all this then you will be a very hard to kill dps.

Ok I always take <Spirit Fire> first because it his only ranged attack. It really helps with the beginning game ganks. Now to clarify what I love about <Spirit Fire> from before, it just has so many uses. You can use it to farm, to cover an escape route (yours or theirs), tower defense, tower offense(drop on minions and watch them die as you keep hitting tower). This is an amazing spell.

Ok <siphoning strike> is your main attack. I love <Spirit Fire> but <Siphoning Strike> is how you kill things. The only trick is that you need to farm last hits off minions, which isn't really that hard considering that with the second rank of it you can pretty much one shot any of the regular minions. Another great thing about this is it works on towers. Yes you heard right. Properly done about 4 of these can take out a tower completely by midgame.

<Wither> is not a horrible spell. I take the first rank at level 3 and leave it alone until i have to rank it up more. It is like having your own personal exhaust on a short cd. It also slows attack speed which allows you to be even more tankier against melee.

Now Nasus' ult is just plain amazing. It turns you into a walking wrecking ball. I've gotten many multi kills by myself using this. This combined with Sunfire Cape is just stupid op.

Ok you have a couple choices here but you pretty much NEED either Ghost or Flash. Nasus is a melee guy for the most part so its just how it goes.

Now I like Ignite for my second. I usually use Exhaust as my second but its really redundant with Wither. Ignite helps against super high dps casters.