Gameplay thought: Introducing "sticky slow"

With more & more tenacity introduced in champion kits & masteries I feel some slows have lost their impact a little bit. A good example of this is {{champion:86}}. So I was wondering how about introducing a slowing status that can't be reduced by Tenacity. I would like to see this status effect on {{item:3905}}. As a Zyra main I find Twin Shadows fun to use but when their are times I need it I useally take {{item:3116}}. The tiny range increase is nice but so situational it's so uncommon alternative. I believe adding sticky slow to twin shadows would be a nice counterplay against tenacity stacking. What they can do as well it letting slow resist still effect sticky slow. This means they can still reduce the slow strength but no longer the duration. Thoughts?
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