Abilities of Nasus
Spell skill priority is an important winning factor for Nasus. Understanding the abilities of Nasus in League of Legends is another. Below you can find all the relevant information on Nasus abilities. In order for item builds you should check the build for Nasus.
Passive: Soul Eater
Nasus drains his foe's spiritual energy, giving him bonus Life Steal.
Siphoning Strike
Nasus strikes his foe, dealing damage and increasing the power of his future Siphoning Strikes if he slays his target.
Nasus' next Attack deals totaldamage physical damage. Killing an enemy with this Attack permanently increases its damage by basicstacks, increased to bigstacks against champions, large minions and large jungle monsters.
Wither
Nasus ages an enemy champion, decelerating their Move Speed and Attack Speed over time.
Nasus ages a champion, Slowing them by slowbase%, increasing to maxslowtooltiponly% over duration seconds. Their Attack Speed is also reduced by attackspeedslowmult*100% of the Slow.
Spirit Fire
Nasus unleashes a spirit flame at a location, dealing damage and reducing the Armor of enemies who stand on it.
Nasus ignites a spirit flame, dealing initialdamage magic damage. Enemies in the area lose e2% Armor and take totaldotdamage magic damage over e3 seconds.
Fury of the Sands
Nasus unleashes a mighty sandstorm that batters nearby enemies. While the storm rages, he gains increased Health, Attack Range, damages nearby enemies, has a reduced cooldown on Siphoning Strike, and gains bonus Armor and Magic Resistance.
Nasus becomes empowered in the sandstorm for 15 seconds, increasing his maximum Health by bonushealth and Armor and Magic Resistance by initialresistgain.
While the storm rages, nearby enemies take damagecalc of their maximum Health as magic damage each second and Siphoning Strike has a qcdr*100% reduced Cooldown.
FAQ on Nasus
What do you max first on Nasus?
Most Nasus pros max out 
Siphoning Strike first.