Hello Guys! It's Living Doom here and I have a quick Nasus guide for you! Enjoy!

BTW, This guide is still in proccess! (I'm learning how to do all the fancy stuff the other guide makers do!)

Pros
-Insane pushing with [Siphoning Strike]
-Natural Insane damage
-Extremely powerful slow
-[Spirit Fire] reduces champions' armor in its range
Cons
-No form of hard CC
-Needs to be tanky
-Countered by silence and tanks that deal insane damage early game (like Riven or Garen)

This is very, very crucial to Nasus. Be sure that almost every minion/monster you last hit is with your [Siphoning Strike]! Remember: Farming is wayyyyyyyyyyyyyyyy more important than getting kills for Nasus.

[Siphoning Strike]

Simply my favorite spell in the entire game. It deals additional damage based on your attack damage and anything you killed with [Siphoning Strike] (3 damage for normal minions/monsters and 6 for tank minions/big monsters). This is the reason why kills don't mean anything to Nasus. Just get your Q, keep farming till 200 normal minions (easy of course unless zoned), and BAM! That's exactly 600 additional damage to your [Siphoning Strike]!
Tip: The good thing about this ability is that Nasus just keeps snowballing. Hell, take the game to two hours and get Nasus more than 2,000 CS (which is totally possible), you get 6,000 damage on your hit. If you get fed enough with Nasus, you can literally two-shot everyone with this spell. Just farm.