Fully updated the post. A lot of helpful information you should share with your friends. It opens up possiblities on champions like Nasus and Udyr who don't have strong gap closers.
Originally Posted by Wriggle
Good job on the math, especially on figuring out it was additive instead of multiplicative. This is good info.
All I have to mention is that it explicitly says "slowing EFFECTS are reduced by x%" as opposed to "slow DURATION is reduced by x%", so that was kind of obvious
Have to be certain though, sometimes wording isn't clear to me. I was looking at the mastery which states "Relentless: Reduces the effectiveness of slows by %."
Interesting effects though. If you look at the Volibear numbers, with 405 MS with 40% slow resistance vs. 0%, hes moving at 323 instead of 183 with his Q up.
Also, good luck catching Singed with these new boots+ masteries. It hes even more slippery than before.