Hi, welcome to yet another build of nasus, with this do not want to upset any theory about this cute Champion, but with you to assess the actual functionality of this build, very versatile and extremely adaptable. ENJOY.

(excuse my bad knowledge of English)

I appeal especially to those who already know and play with this Champion, but also wants to be a sort of first contact for those who knew him.

Nasus has many merits, is a good farmer in lane with the Spirit Fire, in solo and in couple, and his lifesteal that allows him to oversee and / or pushing the lane without having to go Base, and finally have a creeping Siphoning Strike that grows 3 to every minion or enemy killed, not to mention his ability to slow enemies the run or pursuit.
Let's go

The main problem of the first phase of the game is mana .... never enough ... to remedy the problem I put the following runes:

9x Greater Glyph of Replenishment Greater Glyph of Replenishment
9x Greater Seal of Replenishment Greater Seal of Replenishment
3x Greater Quintessence of Intellect

By purchasing the Chalice of Harmony, as we shall see, you can spam the spirits fire at will, and farm many minions....how you can see in video below the regen is very high
Play Video

Items Part 1
We leave for the lane with 1 Meki Pendant and 2 potions of your choice.
When you can, buy the Chalice and the Sheen and the Boots of Speed .... This will happen approximately the 4 or 5 level, unless you do a kill will not happen before.
With the Chalice you can spam the Spirit Fire without getting run out of mana, and with the Sheen can start accumulating points on Siphoning Strike.
As soon as possible to complete the Mercury's Treads, and start putting the pieces of the Sunfire, (I prefer from Giant's Belt, but you can also do otherwise).

Items Part 2/Physical
At this point, you should choose what to do based on the opposing team and your team.
If the enemy team is the prevalence of physical or bodily harm if you feel that is the strength of the opposing team, we have many choices you can make: With Atma's Impaler translate the 2% of your total health in physical damage, will gain Armor, and a 18% Critical Strike, which will increase if you transform the Sheen in Trinity Force, and not least, you will gain additional damage when you use the Fury of the Sands (for example Fury 2 level, 450 health = 9 Damage)

With the Frozen Heart, mana will no longer be a big problem, so we can decide to sell the Chalice, for another item such as an Aegis or/and Guardian Angel. Ultimately you may decide to transform the Sheen in the Trinity Force or Lich Bane.

In the video below you can see the damage and the strength of this build (only one consideration: we were in with a 4 leaver, look at the score); ith this build you can tank, and hit heavly, if you see when Nasus use Fury of the Sand, the damage go up to 320, with Siponing Strike (110 level 5) + Trinity (150% Base Damagein one hit) + Stack of Sifoning (159 I guess), you have a very high damage.
Play Video
Item Part 2/Magic
The same considerations as before, but with the choice of the Banshee's Veil, to stop the negative enchant and Force of Nature with its beautiful regen. In this case, the Chalice should no longer serve, so it suggest a Hexdrinker (if in the enemy team you have Malzahar, you can take a Quicksilver Sash for a nice spell interptus), and transform the Sheen in the Lich Bane.

I hope to insert some videos soon....I thank You and I hope you give me a few votes of encouragement for my first guide