User blog comment:YourPrivateNightmare/Unnecessary custom Graves changes/@comment-25228021-20141109142641/@comment-5077844-20141109150458

that#S a very good question and I can give you an exact answer...because I just used random numbers that looked like I thought about it.

Also I thought, that it should have more CD on lower levels to stop you from abusing the instant passive stacking in lane.