Talk:Viktor/@comment-24241164-20140913141536/@comment-25401282-20140920225126

I'm not sure how so many people are getting this wrong when it's written in the lifesteal/spellvamp sections of this wiki, but just to clear things up:

1) Lifesteal only works on Auto-attacks and abilities that trigger on-hit effects, and will grant the lifesteal value in healing for any physical damage portion of the attack. Therefore, physical damage on-hit effects (like BotRK or sheen) will also work with lifesteal, whereas magical damage on-hit effects (like wits end or nashors) will not. This also mean abilities that proc on-hit effects (like Ezreal's Q and Nasus's Q) will also proc lifesteal.

2) Spellvamp will apply to any type of damage caused by spells, including physical and true damage. This includes items actives and summoner spells like ignite or, more notably, smite. Normally spell vamp will not apply to any on-hit effects caused by items or champion abilities (like Kog'Maw's w or Teemo's e), but there are exceptions to this, the most common of which being Jax's w and ult passive, which will proc lifesteal (on the physical damage) AND spell vamp (on the spell damage), despite being an AA modifier. In addition, spells that proc on-hit effects will normally not proc spellvamp (again, like Ezreal's Q and Nasus's Q).

To answer the original question: It will not proc lifesteal, since there is no physical damage portion to the attack, but chances are it will not proc spell vamp either (although I haven't actually played him, so there is the possibility that it does). You probably are better off buying something like lich bane.