User blog comment:Ralattt/Charlie, the Secret Agent/@comment-7481207-20140207103244/@comment-7481207-20140207191430

Exceot, you know, it works on every negative effect except those that prevent movement, such as slows, silence, blinds as well as forced movement such as taunt, fear and charm. Also, negative effects aren't limited to crowd control, as I mentioned above, it would reduce duration of damage over time spells, making them deal far less damage.