Just cuz your brusier top has hard CC doesn't mean you take CotC
Courage of the Colossus • Courage of the Colossus Effects Gain a shield for 20 - 190 (based on level) (+ 5% maximum health per nearby enemy champion) for 4 seconds after hitting an enemy champion with a >stun, taunt, snare, or knock up. Cooldown 45 - 30 (based on level) seconds
I keep seeing Udyrs and Renekons and other single target hard CC champions taking CotC. You aren't maximizing your keystone mastery! CotC is best used on champions that have AOE hard CC:
etc...
You'd probably be better off going with grasp or another mastery because you are operating with half a keystone!
and in a teamfight you can hit someone with your pillar, which has a TINY knockup duration, and get a free bitchass 190 +25% max health shield. Every 30 seconds.
[slayer-jinx-unamused]