Each takedown you acquire reduces this timer by 120 seconds.
Additionally, when Amumu is hit by an Attack, this Ability's Cooldown is reduced by 0.
When he has enough Experience to finish an ally's level up, he can right-click them to impart it.
If the target is ablaze, Sear will stun the target for 1.
Lux can detonate it to damage enemies in the area of effect.
Try to watch out for it to prevent Cho'Gath from being able to combo his abilities.