I don't know if i missed it somewhere but I would like to know how close enemies need to be in order to proc it. If anyone else has a definitive answer, I'd love to hear it. Thanks.
Danjeng11 votesFear not, fellow summoners, I shall venture into a custom game against bots and test it myself!
...wait a minute, what's this...
Ralanr8 votesWould love to know this too.
Spoofghoul2 votesi think it's roughly 800 range from my experience with it so far
RiotMeddler5 votesClose. It's 1000 range.
Spoofghoul2 votesAh i was too conservative in my estimate i see, i based mine on landing max range Sion Q's which has 600 range and i'd still get the shield even when the other enemies where further outside of it.
Danjeng1 votesYes, Our prayers have been answered! All hail Meddler, who hath blesséd us with the precise ambit of ten Teemo-diameters. The mighty CoC will be our savior from damage creep (unless you're playing a champion with no hard cc, then gg).
Monsta Moo2 votesTry an 
ult across the map with the mastery on and see if you get the shield or not. Then you will have your answer, im too lazy to test this right now ^_^
TheySeeMeWardin1 votesAny Hard CC: snares, stuns, charms, fears, knock-ups, and displacement effects (hook, knock-backs, etc.) Hope that helps.
KekOfTheFinest5 votesHe means the range. Like you hard CC one target,and theres another guy nearby,how nearby does he need to be for the CoTC to proc?
Mig892 votesI know hard cc procs it but an example of my question is: If I am amumu and Ult and I catch two and the other three are in close proximity to my Ult range, will i get the extra shield from the nearby enemies who were not caught?
invisiblecat11 votesI would say about malphite ult range from where the cc is used
ShadowParker1 votesDon't think it has a range. I know Braum passive is a good example of this.
Someone feel free to test it.
Dracocrash1 votesfrom my experiance, about an ashe auto attack range and a half.
Ryuko x Matoi1 votes[deleted]
GrReaper962 votesThe shield will always proc for 1 enemy i think
Mig893 votesyeah, its 10 + 10 per level + 7% for each enemy nearby
dapositiveviking1 votesi'm assuming they wouldn't change it drastically from wukong/irelia passive ranges or the legendary guardian passive
Randomonium1 votesI was planning on making a video testing this later this week. I'll let you know how it goes once I do.
RogueWill1 votesIs slightly shorter than sunfire cape
