Talk:Yasuo/@comment-10891982-20140326035916/@comment-4192193-20140327080458

It reduces all you critical damage by 10%, so I assume the formula would be: 200% (base) + 10% (from runes) = 210%. Then, this 210% gets reduced by 10%, so the final crit damage would be 189% crit damage. This works the same when we add an Infinity Edge.