User blog comment:Leyrann/Tha'vor, the Blade of the Void/@comment-9558107-20130514205428/@comment-9558107-20130514210750

How about something like this, for the Ult.

Passive: Reduces the effectiveness of crowd control effects by 5/10/15% based on level

Active: Immediately removes all crowd controll effects from Tha'Vor uses 1 charge. Charges are  after some time (reducable by cooldown reduction) or when making a kill or assist. 1 Charge can be stored at a time.

Same mana cost cooldown should probably be 80/70/60 seconds. Maybe also do away with charges and just have it reset on kill or assist.