Nasus drains his foe's spiritual energy, giving him a natural 14 / 17 / 20% lifesteal.
Siphoning Strike
Cooldown: 8 / 7 / 6 / 5 / 4
Cost: 20 mana
Active: Nasus' next attack within 10 seconds will deal additional physical damage. Siphoning Strike permanently gains 3 damage if it kills an enemy unit. This bonus is doubled for killing champions, large minions and large monsters.
Total Damage: 30 / 50 / 70 / 90 / 110 (+ 100% AD)(+3 [+6] per enemy killed by Siphoning Strike)
Wither
Range: 700 (800 during Fury of the Sands)
Cooldown: 15 / 14 / 13 / 12 / 11
Cost: 80 mana
Active: Nasus ages his target, slowing their movement speed by 35% for 5 seconds. The slow increases over the duration. The target's attack speed is also slowed by half the amount, initially slowed by 17.5% and increasing over the duration.
If the duration of Wither is reduced by crowd control reduction, the increasing slow is applied faster so that it reaches the same max amount at the end.
Additional Movement Slow per second: 3 / 6 / 9 / 12 / 15%
Active: Nasus unleashes a spirit flame at a target 400-radius area, dealing magic damage to enemies caught within. The spirit flame burns for 5 seconds afterwards, dealing magic damage each second and reducing the armor of enemies within the area.
Active: Nasus summons a sandstorm to empower himself for 15 seconds, enlarging his size and gaining bonus health, 50 bonus attack range, and 100 bonus cast range.
Health Gain: 300 / 450 / 600
While the storm rages, enemies within 175 range take magic damage equal to a percentage of their maximum health (max of 240 magic damage per second per enemy). Nasus converts 6.375% of the damage done by the sandstorm into bonus attack damage for himself.
Magic Damage Per Second: 3% / 4% / 5% (+ 1% per 100 AP)of enemies' maximum health
Total Magic Damage: 45% / 60% / 75% (+ 15% per 100 AP)of enemies' maximum health
1350 or 
585
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