Board Thread:Questions and Answers/@comment-64.233.173.151-20151010103748/@comment-26486243-20151028211847

It's 5% from the statistical data available linked on the Combat and several other pages, and furthermore suspected to be a pre-luck cap bonus. Kindly avoid attempting to answer questions you're not even reasonably sure about. It's one thing to be wrong about something since there is nobody that will be correct all of the time, but quite another to say something you don't even confidently believe is correct.