Since I stared playing 
only in season 6 i found out that you could use 
to activate 's E without hitting an enemy with an auto or ability. Starting in patch 6.6 I found out that this doesn't work anymore, I assumed this was just a bug that just finally got fixed but then i checked the patch notes and there isn't anything about it. I'm also kinda hoping someone could fix this, but i understand if it was just a bug.
Void Nargacuga1 votesSlows no longer stack since 5.13 scroll down a little bit to read the full details. Both 's E and 
smite upgrade are slows. Yes it says "Steals" but its just a simultaneous slow for them and movement speed boost for you at the same time.
Midriff Molester1 votes[{quoted}](name=Bow hunter 16,realm=NA,application-id=LqLKtMpN,discussion-id=9nymiEsl,comment-id=0000,timestamp=2016-03-24T08:56:00.470+0000)
Slows no longer stack since 5.13 scroll down a little bit to read the full details. Both
You're right, I know that only the strongest slow affects the enemy i honestly didn't buy for it's slow, I bought it because like I said before if I smite a champion I can set off 's E without hitting an ability or autoing them.
Midriff Molester1 votes[{quoted}](name=Bow hunter 16,realm=NA,application-id=LqLKtMpN,discussion-id=9nymiEsl,comment-id=000000010000,timestamp=2016-03-24T09:30:31.687+0000)
I dont think that's the same either, because didnt set off any on hit spell effects like runic echo, it just allowed to set off her E on a champion hit with blue smite
Void Nargacuga1 votesRunic Echo enchantment with Smite if it was left the way it was before patch 6.1 could apply a true damage "nuke" and because it counted as a Spell it would have activated (at full charges) the Runic Echo passive creating a magic damage "nuke" on top of the true damage already dealt. Since it wasn't kept that way that is probably why it doesn't interact with Sejuani's Permafrost anymore. That is just my guess though.
no longer triggers spell affects