damage dealt * spell vamp = health restored
Imagine Nunu with two Hextech Revolvers which gives 40% spell vamp and 80 AP. His Q at lvl 5 deals
On other hand, Nunu has ultimate which is glorious for farming creeps. You can kill even few minion's waves in a second and run away. Dont be shy, use your ultimate on creeps whenever you can. It has short cooldown and in teamfight it will be interrupted anyway. That technique allows you to buy that additional Hextechs.
Next time we will talk about spellvamp's impact on Absolute Zero. It deals