Forum talk:Neekerivittu/@comment-1663379-20121105184547/@comment-4726614-20121105195739

"Contempt for the Weak (Passive): Whenever Zed attacks an enemy below 50% Health, he deals an additional 8% of their maximum Health as magic damage. This effect has a short cooldown." This is the official version.

"This effect cannot occur on the same target more than once every 10 seconds." This is the wiki version, added on 2 November.

But, if you were speaking of the champion reveal from Riot, then precise it, altough I don't believe it's the right place for this.