Talk:Nautilus/@comment-77.8.183.232-20120214151120/@comment-4499980-20120214151513

It applies to your current cooldown. If you have 30% cdr and your cooldown is at 7 seconds, the 50% will apply to that. So you'll be left with a 3.5 sec cooldown. In game the tooltip tells you what the reduction will be in numbers.