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I always wonder how early I should get a Will of the Ancients over Hextech Revolver. How much it will it affect the rest of my team?

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I'm not quite sure what you're asking, as the question title seems not to entirely mesh with the question body. If you're asking for a list of abilities/items that are affected by Spell Vamp, it wouldn't be very constructive or viable for us to list a spell for every champ, as that would be very unwieldy and quickly go out of date. If you want to compare the effectiveness of WotA vs. Hextech Revolver, that's a different question. Either way, could you please add some information about a specific champion or team build you're thinking of? You'll likely get a better answer then. –  FAE Mar 17 '12 at 17:14

3 Answers 3

So I think that I'm seeing two real questions here:

  1. Do on-hit effects proc spell vamp?, and
  2. Can items proc spell vamp?

The first question is a bit of an odd case, because it really depends on what you mean.

On-Hit Abilities

Some abilities, such as Gangplank's or Ezreal's Q are treated exactly like auto-attacks. These trigger on-hit items like Black Cleaver, as well as trigger Life Steal and other effects (depending on the champion).

On-Next-Hit Abilities

The second kind of attacks are "on-next-hit", which modify the champion's next attack and reset the auto-attack timer. These are abilities like Nasus' Siphoning Strike, Blitzcrank's Power Fist, and Garen's Decisive Strike. These also trigger Life Steal and not Spell Vamp.

However, to confuse things, there are also "On-Next-Hit" Abilities that trigger spell vamp, such as Poppy's Devastating Blow, and Mordekaiser's Mace of Spades.

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Note that Poppy only has spell vamp in this picture. The 15 damage that is visible is from Malady's proc, which was triggered by Devastating Blow.

The only difference between the two types of abilities is that one adds a bonus to your auto-attack, and the other one replaces your auto-attack. The easiest way to test this is to use the ability against a tower. Since towers are (essentially) immune to abilities, if you use it against a tower, and it does not consume the charge of the ability, it uses spell vamp. If you do manage to deal bonus damage to the tower, it uses life steal.

Physical Damage Abilities

Finally, you have some abilities that deal physical damage, but are not auto attacks. These are things like Garen's Judgement, or Urgot's Acid Hunter. These things deal physical damage, but, because they are abilities, use Spell Vamp instead of Life Steal.

In general, any given ability onlys benefit from Life Steal or Spell Vamp, not both.

So, should you rush a Will of the Ancients? It depends entirely on what champions you have on your team.

Spell Vamp and Items

As to your second question, the answer is much simpler: Item's with on-hit damage effects, such as Wit's End, Madred's Razor (and derivatives), or Malady, never proc Spell Vamp.

Deathfire Grasp or Hextech Gunblade, items with direct activations, however, will.

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if you use it against a tower, and it does not consume the charge of the ability, it uses spell vamp. Something I knew in the back of my head somewhere but just realised it. Handy quote! –  Joetjah May 22 '13 at 7:10

Activated items are effected by spell vamp. This includes things like Hextech Gunblade, Deathfire Grasp, and even Smite.

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General rules were covered in other answers, though there are some exceptions. Kayle's Righterous Fury (E) is one of those on-hit abilities which do proc spellvamp, for example.

As per LOL Wiki. I have no full list of such exceptions as of yet.

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