User blog comment:ClariS/A Moment for Clarity/@comment-6301771-20130415171711/@comment-4881935-20130416012524

Four issues I have with keeping it AoE:
 * 1) The cooldown is too high for the early game, making it rather bad (even though it was never that great). AoE is really the only thing that justify the high cooldown.
 * 2) Lowering cooldown (where it would be useful early game) while keeping it AoE will make mana just a 'worthless' and non-managing stat as this would completely negate it.
 * 3) Late game, most champion tends to already grab items to help ease their mana problem. You usually will not find yourself in a situation where you're entire team needs mana desperately.
 * 4) Excluding Blitz, no one benefits from getting mana unless they almost run out of mana. So, even if it did effect the entire team, unless they come close of using all their mana within a time frame, the effect of the AoE is rather small.

Lastly, if they are grabbing Muramana, then they don't even need anyone using clarity on them anymore. They already have more than enough mana to sustain themselves.

And this is a rework. Of course there is a nerf, but the strength I'm trying to give it is some early game presence.