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Some people say it does, and some people say it doesn't.

My friend is pretty sure Cho'Gath's Vorpal Spikes does proc Rylai's Crystal Scepter's passive, but we both can't test at the moment. I thought it didn't proc on toggle skills, but he swears it does. The people in the threads I mentioned seem to classify Vorpal Spikes as an AoE spell rather than an on-hit toggle skill... Anyone have some insight on this?

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up vote 5 down vote accepted

I'm thinking it does add the slow from Rylai's. I've been looking on the wiki's and I found this:

The following will not trigger a slow:

  • Champion abilities that do not trigger spell vamp
  • On-hit damage damage dealt by items
  • Summoner Spells, such as Ignite and Smite.
  • Damage dealt by the auto-attacks of Clones and Pets/Minions.'s_Crystal_Scepter

Then on this page I found under:

Abilities — do apply spell vamp:

Area Of Effect
The following effects deal area of effect damage, but are not classified as splash damage: Cho'Gath's Vorpal Spikes

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Good finds. Nice to have this info readily available on the exchange – user41604 Feb 20 '13 at 13:37
I think it is safe to say that it will trigger the 15% slow and not the 35% – Lyrion Feb 20 '13 at 15:33

No, it is not a spell. It is a passive effect, kind of like Teemo's Toxic Shot, which does not proc slow with Rylai's Crystal Scepter.

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Sorry dude, I have to -1 this because you are wrong. :( – user41604 Mar 28 '13 at 11:30

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