Event Horizon buff
What's proposed. After the spell is cast (0.25 sec). Some fraction of the arc facing Veigar is instant. I think 30 degrees would be a nice starting point. Then the wall builds up around both ends simultaneously at a rate such that it reaches the back point in like 0.75 second. The wall lives for like 2 seconds or so. touching the wall stuns you the same way it does now.
What's better about it Many stuns in this game have a trend where they are more reliable at close range, and harder to hit at long range. This allows Veigar to make defensive stuns while making offensive stuns still dodge-able. I think it would make trying to get out of the cage before it closes more interesting.
It might be harder to code, but hey, that's why you make the big bucks.
