on hit effect =?= sheen

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Yeah, sheen is an on-hit effect. It'll be applied by things like Ezreal and Gangplank Q's.

People often get excited thinking they can have it hit multiple times with things that apply multiple on-hit effects either simultaneously or rapidly, or AOE applications, but sheen gets consumed after one application.

oh thats great, thank you

Actually, they do stack in a way. When you have both Trinity Force and Iceborn Gauntlet:

• the target will take damage from by the Trinity Force spellblade (2x Base AD)
• targets around the target(but not the target themselves) will be damaged by the Iceborn Gauntlet spellblade (1.25x Base AD)
• the slow field will appear around the target

Not to say stacking Sheen items is efficient, just pointing out that they do technically stack.

You need to take note that the Sheen proc, Spellblade, is consumed when it's used. When you cast a spell, your next attack gets the bonus. Cool. It's just that next one. Not two. Not three. One.

So, there is no possible way for Ravage to apply multiple procs of Spellblade, as it will get consumed on the first use, like every other time.